13MAY

Interceptor Crisis Reaches Projected Depletion Window

2 min read

20:00UTC

THAAD exhaustion may have arrived silently. Arrow-3 stocks at 81% depletion. JASSM-ER reserves for a Taiwan contingency spent in Iran.

← Back to 800 drones, three ceasefires, one cliff Jump to analysis ↓

ConflictDeveloping

Key takeaway

Defence and strike stocks deplete simultaneously; production cannot catch either.

The Royal United Services Institute projected in early March that THAAD stocks would exhaust within one month; that window has now closed . The Payne Institute estimates one-third of the THAAD stockpile has been consumed. Annual production capacity: roughly 100 interceptors. No emergency resupply has been announced.

Arrow-3 stocks remain at 81% depletion or worse . Combined with the consumption of more than 1,000 JASSM-ERs drawn from Pacific Command stocks , the US is simultaneously drawing down its primary standoff strike capability and its missile defence inventory. The restock gap for JASSM-ERs runs 18 to 30 months under even surge production. The weapons designed for a Taiwan contingency are being spent in Iran.

The arithmetic runs one direction. Iran does not need to win the air war. It needs to outlast the interceptors. With Russia supplying an estimated 1,000 Geran-2 drones per day , the attritional equation favours the side that can produce munitions at industrial scale against a defence architecture that cannot replenish at any scale.

If THAAD and Arrow-3 stocks cross critical thresholds without resupply, the US and Israel face a binary choice: accept degraded air defence or reduce the operational tempo that is consuming the interceptors. Either path changes the war's trajectory.

Deep Analysis

In plain English

The missiles that defend against Iranian attacks are running out, and the factories that make them produce too slowly to catch up. At the same time, the cruise missiles being used to attack Iran were originally set aside for a possible conflict with China, leaving the Pacific less defended. Iran does not need to win; it needs to keep firing until the defences run dry.

Deep Analysis

Root Causes

The US defence-industrial base was optimised for precision and quality over volume. Annual production rates (100 THAAD interceptors, 396 JASSM-ERs at standard rate) assumed deterrence and short, decisive conflicts, not a sustained attritional war against an adversary supported by Russian industrial-scale drone production.

Escalation

Structurally escalatory. As defensive stocks deplete, the risk of successful Iranian strikes on Gulf energy infrastructure increases. This could trigger oil price spikes, Gulf military responses (under the Article 51 framework), or US escalation to compensate for degraded defence with increased offensive operations.

What could happen next?

Missile defence architecture protecting Israel, UAE, and US forces degrades materially by mid-to-late April
weeks · Assessed
JASSM-ER depletion weakens US deterrence posture against China through at least mid-2028
years · Assessed
Degraded air defence increases risk of successful strikes on Gulf energy infrastructure
weeks · Suggested

Source Landscape

This story draws on neutral-leaning sources

Primary parallel: The British torpedo shortage of 1917, when the Royal Navy discovered it was consuming torpedoes faster than industry could produce them, forcing a fundamental rethink of naval strategy. The parallel is structural: a technologically superior force discovering that its precision munitions are finite against an adversary that can absorb losses.

Counter-parallel: The Soviet experience in Afghanistan, where advanced weapons were consumed at unsustainable rates against a lower-technology adversary. The Soviets adapted by shifting to cheaper munitions and ground operations. The US may face similar adaptation pressure.

Consensus view: The convergence of Arrow-3, THAAD, and JASSM-ER depletion represents a strategic munitions crisis unprecedented in modern US military operations. Annual THAAD production of roughly 100 interceptors cannot replace stocks consumed at current rates within any operationally relevant timeframe. The defence-industrial base was not designed for this consumption rate.

Counter-view: Official depletion figures are classified, and external estimates from RUSI and the Payne Institute rely on modelling rather than confirmed data. Actual stocks may be higher than projected if pre-war inventories were larger than publicly known, or if consumption rates have been lower than assumed.

Key tension: The US is simultaneously depleting its primary standoff strike capability (JASSM-ER) and its missile defence inventory (THAAD, Arrow-3). The weapons reserved for a Pacific contingency are being spent in a Middle Eastern war, with no production capacity to close the gap within two years.

Sources:Defence Security Asia / RUSI

Mentions:RUSI →Wyss Institute →THAAD →Arrow-3 →Afghanistan →Iran →attrition →Israel →China →Royal Navy →Prima →Russia →Taiwan →Geran-2 →JASSM-ER →

First Reported In

Update #60 · Pakistan's Ceasefire Plan Fills the Vacuum

Defence Security Asia / RUSI· 6 Apr 2026

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Causes and effects

Caused by

Arrow-3 stocks hit 81 per cent drain

Arrow-3 at 81% depletion and THAAD one month from exhaustion (ID:1935) projected thresholds now appear to have been reached.

Occurred 4 Apr 2026

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Iran War Burns Through Pacific Missile Reserves

1,000+ JASSM-ERs consumed from Pacific stocks (ID:1977) compounds the defensive depletion crisis with offensive depletion.

Occurred 4 Apr 2026

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Russia sends upgraded drones to Iran

Russia delivering upgraded Geran-2 drones at 1,000 per day (ID:1937) accelerates the interceptor depletion rate.

Occurred 3 Apr 2026

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This Event

Interceptor Crisis Reaches Projected Depletion Window

The convergence of Arrow-3 depletion, projected THAAD exhaustion, and JASSM-ER consumption from Pacific stocks represents a strategic munitions crisis across both offence and defence simultaneously. The US is fighting a war of attrition with weapons it cannot replace on any operationally relevant timeline.

Led to

Pentagon briefs strikes up, missiles down

Interceptor depletion at critical thresholds (ID:2050) may partly explain why Iran's outbound missile rate fell to its war low alongside the Hegseth briefing.

Occurred 7 Apr 2026

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Forty days of war, zero new executive instruments

Interceptor depletion at critical thresholds is the operational reality under the absence of new executive instruments.

Occurred 8 Apr 2026

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Different Perspectives

NATO eastern flank (B9 + Nordics)

The B9+Nordic Bucharest joint statement on 13 May reaffirmed Ukraine's sovereignty within internationally recognised borders and backed NATO eastern flank reinforcement; the summit accepted Zelenskyy's bilateral drone deal proposal as a structural alternative to the stalled US export approval pathway, treating it as a European defence architecture question rather than aid delivery.

IAEA / Rafael Grossi

Grossi is still negotiating a sixth ZNPP repair ceasefire with no agreement after 50 days of 750 kV line disconnection; the 3 May ERCL drone strike that destroyed environmental monitoring equipment represents a qualitative escalation in infrastructure degradation that the IAEA has documented but cannot compel either party to halt.

Péter Magyar / Hungary

Magyar's incoming foreign minister pledged on 12 May that Hungary will stop abusing EU veto rights; the pledge is a statement of intent rather than a binding legal commitment, and Magyar's MEPs voted against the €90 billion loan as recently as April, while a planned referendum on Ukraine's EU accession preserves a downstream blocking lever.

EU Council and European Commission

The Magyar cabinet formation on 12 May removes the Hungary veto that had blocked the €9.1 billion first tranche since February; the Commission is now coordinating the three-document disbursement package for an early-June vote. The structural blocker is gone; the disbursement question is now scheduling, not politics.

Donald Trump / White House

Trump announced a 9-11 May three-day ceasefire with a 1,000-for-1,000 prisoner exchange attached, then called peace 'getting very close' on 11-13 May while Russia's 800-drone barrage was under way; his public framing adopted Russian diplomatic language without securing any Russian operational concession or verifying the exchange was agreed.

Vladimir Putin / Kremlin

Putin told reporters on 9 May the war is 'coming to an end' while Peskov confirmed on 13 May that territorial demands are unchanged and Russia requires full Ukrainian withdrawal from all four annexed regions; the verbal accommodation costs Moscow nothing and conditions any summit on a pre-finalised treaty Kyiv cannot accept.