A symbolic scene of Saudi–Houthi conflict and Iranian influence. The two Yemeni-flagged camps represent the Houthis and Saudi-backed government forces based in the south.
The power to threaten narrow sea routes changes bargaining power. Mayun Island, also called Perim, lies in the Bab el-Mandeb Strait. In September, the Houthis expanded around Mocha port and this island. Securing ports and islands makes it easier to monitor and threaten ships. But gaining coastal bases does not mean controlling the entire strait.
On 9/22, news emerged of US–Iran negotiations in New York. Iran's conditions included lifting the naval blockade, returning frozen assets and ending the war on all fronts. Yemen's war could thus become linked to broader negotiations. With whom, then, are the Houthis trying to trade what?
#19 followed the price of a barrel; #20, the value of by-products. This report examines bargaining over the routes oil travels. Having nothing to lose is a metaphor in the title. The Houthis, too, have people, territory and revenue sources to protect. As those burdens grow, their behavior may change.
Yemen's public finances and economy are broadly divided into two areas. The Houthis govern the northwest around Sana'a; the internationally recognized government and several regional forces share control of the south around Aden. The north relies on its collection system; the south on outside support replacing blocked exports.
In Houthi-governed areas, taxes and customs are supplemented by levies and war donations. In July, the Mokha Center for Strategic Studies estimated roughly USD 2.5 billion a year. But that includes USD 700 million in indirect business costs such as transport and services. The total cannot all be counted as Houthi revenue. The US Treasury's estimate of more than USD 2 billion a year from illicit oil sales is a separate tally.
The southern government lost crude exports, a key revenue source, after export terminals were attacked in late 2022. The World Bank's May review this year also documents halted exports, fiscal distress and the role of Saudi support. This does not establish that the south benefits more from war than peace. Resuming exports is, instead, an important condition for recovery.
Chart 1
Two economies, different fiscal weaknesses
Separate the north's collection structure from the south's halted exports.
North · Houthi-governed areas
2.5 billion USD / Annual estimate
Total funding and burdens tallied by the Mokha Center. Includes USD 700 million in indirect business costs.
Taxes/customs 800m Fees 600m War donations 300m Mobilization events 100m Indirect business costs 700m
South · Internationally recognized government
Crude exports halted
Attacks on terminals in late 2022 blocked a key revenue source. Saudi financial aid and other support provide a cushion.
The US Treasury separately estimated the Houthis' oil-sales revenue at more than USD 2 billion a year. Its coverage differs from the USD 2.5 billion above; do not add the two.
Sources: Mokha Center July estimate (cited by Al Jazeera 9/14), US Treasury 1/16, World Bank 5/21. Do not read this total as the Houthis' net revenue or profit.
Negotiations must also address livelihoods after the war. The roadmap outlined by the UN special envoy in December 2023 included public-sector salaries and resumption of crude exports. A ceasefire alone does not decide who supplies the money or how it is paid. The task is to restore livelihoods while changing the collection structures formed during the war (Office of the UN Special Envoy).
Meanwhile, residents' burdens have grown. The UN estimated 22.3 million people need assistance and protection this year. Reports on 9/22 tallied 674 deaths and about 3,000 injuries since 8/6, and more than 158 thousand people displaced in September. This is why the interests of those earning wartime revenue cannot be equated with residents' interests.
Details · Sources for revenue estimates and humanitarian harm
Al Jazeera 9/14: Report citing the Mokha Center. The components total USD (8+6+3+1+7) hundred million = USD 2.5 billion; the final USD 700 million is indirect business costs.
US Treasury 1/16: Estimated illicit oil-sales revenue. Its overlap with the earlier tally has not been established.
UN humanitarian plan: People needing assistance over the year. Al Jazeera 9/22: Casualties cite WHO; displacement cites Yemen's responsible agencies. Periods and compiling agencies differ.
02
Low-cost attacks, different threats for each opponent
To assess Houthi bargaining power, what matters is how long they can impose costs on the other side. Countering relatively cheap attacks with expensive interceptors burdens defenders. But unit-cost differences alone do not tell us which side can endure. We must also consider defensive systems, stocks and the value of ships and lives protected.
Chart 2
Attack–defense unit costs, and what to examine next
Examples of reported unit costs reviewed by CSIS in 2024 · USD · Log scale
Houthi drone · Reported example at the time USD 2 thousand
SM-2 interceptor · Reported example at the time USD 2 million
1k 10 thousand 100 thousand 1 million 10 million
Unit cost The gap in this example is 1,000x. Each interval represents a 10x increase.
Staying power Consider interceptor stocks, replenishment speed and other defensive tools together.
Value of defense Lives, ships and cargo protected also enter the cost assessment.
CSIS, 2024. 2. 13 reviewed this comparison. It does not represent actual 2026 procurement prices or a cost ratio for every engagement. Weapons prices alone cannot calculate a war's endurance or a negotiating outcome.
Threats were carried out differently against different targets. Our 8/10 research ledger recorded implementation of 5 out of 5 Houthi threats against Saudi Arabia, versus 1 out of 3 against Israel and international shipping. The sample is small and sensitive to selection. It cannot establish that the Houthis always keep promises or that the poorer party is more credible.
Chart 3
The same actor differed by opponent and type of promise
Research ledger covering May 2025–August 10, 2026 · Selected sample, not a census of events
● Implemented in the ledger ○ Unfulfilled/delayed | Each dot is one case
Houthis → Saudi Arabia Implemented within 0–48 hours
5 / 5 cases
Houthis → Israel/international shipping Cases with different targets and conditions
1 / 3 cases
Houthis → Full blockade, etc. Broad threats
0 / 2 cases
Iran → Expanded maritime force Escalation cases
4 / 4 cases
Iran → Reopening promises Classified as reversed/unfulfilled
0 / 3 cases
US → Dated ultimatums Classified as deadline extensions
0 / 4 cases
US → Economic/maritime measures Implemented measures
4 / 4 cases
Saudi Arabia → Houthis Announced responses
0 / 2 cases
Source: Boboo from Sky actor-research ledger, compiled 8/10. Samples of 2–5 cases are small and depend on event selection and classification. These are not current probabilities or general measures of credibility. September actions are verified separately, outside this table.
Port revenue and payments for strait passage must also be distinguished. Customs on cargo entering a port differ from payments imposed on ships passing through a strait. Estimates of informal payments for the latter lack sufficient independent verification. Selective attacks to maximize passage fees therefore remain a possible hypothesis.
Freightos' 9/15 report said some container lines had increased their return to the Red Sea despite the Houthi offensive. Maersk also published route-specific operating updates on 9/9. This differs from a complete shipping halt. But container ships' return does not establish the safety of Saudi crude tankers or a Houthi permission system.
Easing tensions also requires workable payment channels. The US designated the Houthis a Foreign Terrorist Organization (FTO) in March 2025. At the same time, OFAC rules permit some noncommercial personal remittances and humanitarian transactions. It is not possible to conclude that all salary transfers are legally impossible. Any specific salary agreement requires separate checks of the payer, recipient, funding route and applicable law (OFAC explanation).
03
Another gate at the end of the detour
Saudi crude's main export routes run through Gulf ports or Yanbu on the Red Sea. The Gulf route requires crossing Hormuz. Crude moved to Yanbu through the East–West Pipeline then takes different routes by destination. The direct southern route to Asia passes through Bab el-Mandeb.
Europe-bound shipments can go north via the Suez Canal or SUMED Pipeline. Asia-bound cargo can also go north and take a long detour, but that increases transit time and transshipment costs. Houthi threats against Saudi-linked vessels are thus better understood as making the southern route from Yanbu difficult, rather than blocking all exports at once.
Chart 4
Even Saudi Arabia's detour splits by destination
Conceptual crude-export routes · Not a scaled map or a statement of current operations
Gulf maritime route
Gulf ports Eastern Saudi Arabia
→
① Hormuz Conflict with Iran Passage restrictions
→
Open sea/Asia Verify actual passage
Red Sea detour
Eastern Saudi Arabia Oil fields/processing facilities
→
② East–West Pipeline Stopped 9/11 Restarted 9/22
→
Yanbu port Verify loading/departure
North Suez Canal/SUMED Pipeline → Mediterranean/Europe A long detour back to Asia is also possible, with greater transit time and transshipment costs.
South③ Bab el-Mandeb → Direct to Asia The section threatened by the Houthis. Separate declarations about Saudi-linked ships from actual attacks and passage.
The pipeline's design capacity of 7 million barrels/day and Reuters' reported wartime diverted volume of about 4 million barrels/day are different figures. A restart report alone does not establish recovery of that volume.
Sources: Reuters 9/22 republication, internal transport model. Ochre lines mark points exposed to attacks or passage restrictions. They do not mean every point is blocked or controlled by one force.
The 9/22 report marks the first stage of recovery. Citing sources, Reuters reported a low-flow restart of the East–West Pipeline, with forecasts of 40% capacity within days and full restoration in 6–8 weeks. It also reported preparations to load a China-bound cargo at Yanbu. We have not secured official operator confirmation or daily flow figures.
This China-bound cargo is a case to follow through loading, departure, passage and arrival. A Chinese destination alone does not exempt a vessel from Houthi attacks. Ownership, operators and cargo links also differ. Only after verifying its actual route and arrival can we assess how much of Saudi Arabia's export route has recovered.
Oil prices contain both expectations and current constraints. November Brent settled at USD 99.25 on 9/22, while Opinet's Dubai crude was USD 111.20. The difference is USD 11.95, but crude grades and trading/assessment bases differ; it cannot all be counted as a strait-risk premium. Separate reports that expected supply recovery depressed futures from evidence of actual volume recovery.
What one satellite image can show
In the 9/22 satellite-radar reading, detections within the predefined corridors were 0 vessels in Hormuz and 3 in Bab el-Mandeb. These are counts in those areas at the imaging instant, not daily transits or crude volumes.
Details · Recovery reports and price benchmarks
Reuters 9/22: Sources' restart and recovery forecasts. Aramco had not responded at the article's publication. Saudi Arabia reportedly identified Iraqi militias as the attackers.
9/22 oil-settlement report: November Brent USD 99.25. Dubai USD 111.20 is the same-date Opinet observation. The gap is an arithmetic comparison.
Internal satellite reading: both Hormuz and Bab el-Mandeb observed 9/22. This report uses only detection counts, not automatically converted indices.
04
Iran seeks a bundled negotiation; the Houthis move separately
Iran seeks to link the strait to broader negotiations to end the war. Terms reported 9/22 included lifting the naval blockade, returning frozen assets and ending the war on all fronts. Reports of Iranian demands do not establish US agreement. It is too early to read them as an agreement or confirmed implementation.
The same day, Trump said the US and Iran had held three hours of talks. US envoy Witkoff described mediation shuttling between the sides. We therefore do not conclude that US envoys and Iran's foreign minister held direct talks around the same table (Axios 9/22, updated report).
Broader negotiations make implementation harder to guarantee. If Iran seeks to include the Yemen front, the Houthis must also have reason to comply. Iranian support does not mean control over every Houthi decision. Coastal expansion can be read as an attempt to secure their share in negotiations, but this alone does not establish the offensive's cause (our interpretation).
Saudi Arabia is seeking outside support. On 9/22, the UK Ministry of Defence officially announced agreement to provide tanker-aircraft support for Saudi defensive operations. The decision, actual deployment and defensive effect must be verified in sequence (UK Ministry of Defence).
Saudi Arabia needs both fewer Houthi attacks and continued outside security support. An agreement with Iran might ease those burdens, but we cannot assume Iran is the fastest guarantor of a Houthi halt. Who participates in the agreement, and what can be done about noncompliance matter as much as the wording.
05
When different timetables meet
Bargaining power changes over time. In his 9/22 UN speech, Trump said he expected an agreement after the November midterms. That is his forecast, not a deadline agreed by both sides (ABC).
Iran's proposal to open Hormuz within 7 days is conditional on reduced US military pressure and an end to the port blockade. Do not count a week from the report date. Saudi Arabia's 6–8-week pipeline-recovery forecast also needs verification through actual flow (The National 9/22).
Chart 5
Separate fixed dates from conditional clocks
Diplomatic schedules, recovery forecasts and our verification dates differ in nature.
Dates that belong on the calendar
Official visit schedule Xi Jinping's US visit. Verify agreements and implementation after announcements.
Boboo from Sky assessment period ends Date to check 5 preregistered Houthi observations. Not a Houthi deadline.
US election schedule Midterms. An agreement after the election is Trump's forecast.
Iran · Conditional proposal 7 days after prior US action
Reduced military pressure and an end to the port blockade are the starting conditions. Do not count from the 9/22 report date.
Saudi Arabia · Sources' recovery forecast 6–8 weeks after restart
A simple conversion from 9/22 puts it around 11/3–17. This is neither the operator's confirmed schedule nor proof of restored flow.
There is no guarantee the Houthis will retain their current bargaining power. If Hormuz restrictions ease, Saudi Arabia may have less reason to rely on the southern route from Yanbu. Conversely, Houthi pressure may persist if an agreement excludes the Yemen front. This report's hypothesis is that the Houthis seek to convert their military advantage into territory, political participation and economic concessions.
Details · Our model's role and limits
In the 9/23 18:48 KST run, the WTI-based scenario centers were USD 101.4 for continued conditions and USD 121.8 for a Red Sea closure. Assumed effective supply losses under closure range from 680 thousand to 3.04 million barrels/day, centered on 2.62 million. These are not measured losses.
The same file compares WTI front-month futures at USD 89.67 (9/23 16:36 KST). As this is below the continuation scenario's center, simple inversion cannot yield a market-implied probability of Red Sea closure. Do not directly compare Brent at USD 99.25 with a WTI-based model.
The conditional weighted value over roughly 3.5 months is USD 110.8, with an assumed range of USD 97.3–124.1. Neither is a statistical confidence interval or price target. These are provisional, with unverified inputs including actual Saudi transport volumes and demand assumptions.
Assessment continues for 5 Houthi propositions registered on 9/16 and 9/18. After the 10/1 and 10/3 deadlines, check them against their original definitions; withhold judgment if evidence is missing. Results will be revisited in #22.
06
Could China be a guarantor?
China has interests and connections that give it a role in mediation. It is a major buyer of Gulf and Iranian crude. Reuters reported on 9/17 that China asked Iran to restrain the Houthis following a Saudi request. Sources did not identify the channel or say whether the request was conveyed at the 9/16 foreign-ministers' meeting (Reuters republication).
China's foreign ministry officially announced Xi Jinping's US state visit for 9/23–25. The schedule is confirmed; it does not mean China guaranteed Houthi behavior or that the US and China agreed on the strait (Ministry of Foreign Affairs of China).
Success in mediation could affect other negotiations. If China reduces tensions through its relationship with Iran, its position in US–China talks may change. But we have no evidence of an agreed exchange for tariffs, semiconductors or rare earths. Before calling it a guarantor, establish what behavior it promised and what burden it accepts for noncompliance (our interpretation).
07
Gaining territory creates something to lose
Coastal expansion brings both advantages and burdens for the Houthis. A 9/15 Al Jazeera Centre for Studies analysis estimated September gains at about 5,400km², with a roughly 300km supply route from Hodeidah through Mocha to Mayun. Fighting on the move in mountains differs from holding exposed coastal bases.
Chart 6
More coast means more to defend
Geographic scope of the 9/15 research analysis · Later frontline changes require separate verification
Bargaining tools gained
About 5,400 km²
Estimated area gained in the September offensive
Pressure through ports and islands More bases from which to monitor and threaten vessels.
A share to demand at the negotiating table This can create pressure for economic concessions, including port access and salary payments (interpretation).
Greater maintenance burdens
About 300 km
Supply route linking Hodeidah, Mocha and Mayun
Supplying exposed coast and islands Lowland bases must be defended and maritime supply maintained.
They do not control the whole strait The western coast is outside their control. Southern forces may also counterattack.
Reports on 9/22 described Houthi fighting over the Kahbub mountains overlooking the strait and Mayun. This shows the burden of defending the rear even after gaining coast. The same article's more than 157 Saudi airstrikes on 9/21 were Houthi claims, not an independently verified strike count.
This interpretation can be tested in two directions. If the Houthis reduce their offensive, include salaries, port access and sanctions terms in an agreement, and implement it, the bargaining hypothesis strengthens. If they press into the highlands and south while broadening targets, holding territory and expanding war become stronger explanations. Documents and actions must be checked together.
If negotiations drag on
Importers and cargo owners may face detour, transport and insurance burdens for longer.
Producers' revenue depends on export volumes and recovery costs as well as oil prices. High tanker and insurance prices do not guarantee higher net profit.
If only Hormuz eases
More Gulf exports could reduce Saudi Arabia's reliance on the Red Sea detour.
Houthi bargaining power might weaken, but Red Sea navigation risks and Yemen's war would not disappear together.
If Yemen is included in an agreement
Trade and livelihoods have more scope to recover. Crude exports, salary payments and aid systems must recover together.
Losses for some wartime revenue collectors may differ from the benefits to Yemeni residents.
These three branches are conditional interpretations, not return forecasts. Can wartime interests be changed so that peace reaches residents as income? This is the final question in bargaining over narrow sea routes.
08
Other confirmed developments
1
US rates — down by the same amount
On 9/22, the US 10-year nominal yield was 4.96% and the real yield 2.63%. Their difference, the BEI reference measure, was 2.33 percentage points. Both nominal and real yields fell 0.05 percentage points from 9/18, leaving BEI unchanged. This compares two specific dates.
Oracle's capital expenditure for the quarter ended 8/31 was about USD 28.5 billion, versus operating cash flow of about USD 23.1 billion. Operating cash included about USD 11.4 billion in customer prepayments with a financing component. Do not read all operating cash as payment for services already delivered.
Bitcoin was USD 85,478 when collected on 9/23 at 21:09 KST. Farside's US spot Bitcoin ETF tally shows net inflows of USD 999 million on 9/21 and USD 714.7 million on 9/22. These sum reported figures from all funds covered and may be revised later.
Farside tally. Unreported 9/23 cells do not mean 0 inflows.
4
By-products — questions still open
Questions left by #20 remain: current official Chinese sulfuric-acid and phosphate-fertilizer restrictions, October sulfur posted prices, and September trade by product. The next report will continue separating announcements from actual shipments.
Lack of confirmation is not evidence that restrictions were maintained or lifted.
Gauges — v10
We examine seven items separately. The body records what was known at publication; the gauges below load current observations. Event-based items show the date of human verification. We do not create a composite score.
① Tankers in the two straits Watch
Bab el-Mandeb tankers
4.0 vessels/day
2.0 vessels/day above the 2.0 vessels/day threshold
Trigger (below) 2/day · Watch (at or below) 5/day
As of 2026-09-23
TankerMap 7-day average · Date is the query date; window end not provided
Suez tankers
15.7 vessels/day
No status threshold · Reference only
As of 2026-09-23
TankerMap 7-day average · Date is the query date; window end not provided · Excluded from status judgment
Details · Current values and decision rulesBab el-Mandeb tankers 4.0/day · Suez tankers 15.7/day
Bab el-Mandeb tankers below 2/day → trigger; 2–5 → watch. These are vessel counts, not volume (mb/d). An index derived from AIS counts is not crude volume. The two series use different windows and can differ by up to twice; the source description states which was used. Use alternative data if TankerMap fails.
Actual recovery Flow and repeated shipments unconfirmed 2026-09-23 · 6–8 weeks is a source's forecast, not a confirmed schedule
Details · Current values and decision rulesRestart reported · Actual flow unconfirmed
Verify announcement→actual flow→repeated shipments→arrival. Reports alone do not establish full restoration.
As of 2026-09-23
③ Iran's reopening proposal Unconfirmed
Starting condition Reduced military pressure and an end to the port blockade 2026-09-22 · Conditional proposal reported
Implementation Awaiting confirmation of agreement and implementation 2026-09-23 · Read alongside demands to return frozen assets and end the war across all fronts
Details · Current values and decision rules7 days after prior US action · Awaiting confirmed agreement
Verify US action, bilateral agreement and actual transits. Do not count a week from the proposal report.
As of 2026-09-23
④ Different oil-price benchmarks Unconfirmed
Dubai crude USD 111.20/barrel 2026-09-22 · Opinet tally · Different crude grade and assessment basis
Brent settlement USD 99.25/barrel 2026-09-22 · Opinet tally · Different crude grade and assessment basis
Details · Current values and decision rulesDubai USD 111.20/barrel · Brent settlement USD 99.25/barrel
Unconfirmed status means the cause of the price gap has not been isolated. Grades and assessment bases differ; the whole gap is not war risk.
As of 2026-09-22
⑤ Sanctions and payment routes Unconfirmed
Permitted scope Some personal remittances and humanitarian transactions 2026-09-23 · OFAC FAQ 1219
Salary agreement Specific payment structure needs verification 2026-09-23 · Do not assume a comprehensive salary agreement is authorized
Details · Current values and decision rulesScope of authorization for each transaction needs verification
Verify payer, recipient, funding route and applicable authorization. Lifting sanctions differs from authorizing an individual transaction.
As of 2026-09-23
⑥ Weekly US rate changes Waiting
US 10-year real-yield change
+1bp
14bp below the 15bp threshold
Watch (at or above) 15bp
As of 2026-09-22
1bp=0.01pp. Watch if real yields rise by at least 3x the absolute BEI change.
Details · Current values and decision rules+1 / -5bp
Weekly BEI ≥+10bp → trigger. Real-yield rise ≥3x the absolute BEI change → watch. Compare with the last available observation on or before 7 days earlier.
As of 2026-09-22
⑦ Sulfur and sulfuric acid Unconfirmed
Chinese sulfur reference price
CNY 7,669/t
CNY 1,669/t above the CNY 6,000/t threshold
Watch (below) CNY 6,000/t
As of 2026-09-18
Judge by this price only when non-passage through Hormuz is verified.
Hormuz passage Unconfirmed Dated human verification required
Quoted ADNOC posted price$1,000/t FOB 2026-07 · Secondary quotation in the July report · Manual update · Original monthly posted-price URL unavailable
Details · Current values and decision rulesChina CNY 7,669/t (2026-09-18) · ADNOC $1,000/t (2026-07) · Manual update
Confirmed passage → wait. With verified non-passage, Chinese reference price below 6,000 → watch; otherwise trigger. Unverified passage status → unconfirmed.
As of 2026-09-18
Current values load when the page opens. Event-based items show the date of human verification. If the connection fails, publication-date values remain.
Observation continues
#20's stablecoin, ETF and tokenization indicators are available in the crypto observatory. This report's gauges focus more closely on the straits and negotiations. Unconfirmed does not mean stable or normalized.
What to watch, with confirmation conditions
9/23~25 Diplomatic schedule
UN diplomacy and Xi Jinping's US visit What to verify: How do Iran's conditions appear in official documents? Does China or another mediator actually assume responsibility for implementation?
From late September Transport verification
Loading, passage and arrival of Yanbu cargoes What to verify: Do not infer routes from destinations alone. Check vessel identity, actual routes, daily pipeline flows and repeated loadings together.
10/1 · 10/3 Assessment period ends
Check results of 5 Houthi observations What to verify: Apply the previously registered conditions and definitions unchanged. If evidence remains insufficient after the deadline, withhold judgment and explain why in #22.
October Production/shipments
Pipeline restoration and sulfur/sulfuric-acid supply What to verify: Does the recovery forecast translate into actual flow? Do producers' new posted prices and export rules agree with customs clearance and shipments?
11/3 US midterms
Do political forecasts become an agreement? What to verify: Focus on bilateral agreement and implementation sequence, rather than statements about after the election. Assess Iran's 7-day proposal only after verifying that its preconditions are met.
This report's observation rules Statements reveal conditions; loading marks the start of movement; passage and arrival show subsequent implementation. We keep these stages distinct and await the next record.