The US military's stockpile of Patriot missile interceptors in Europe has fallen to a level US and NATO officials describe as "beyond critical," according to France 24.

The shortfall stems from the war with Iran, which drained Patriot supplies, officials said. It raises concerns about NATO's ability to counter a potential Russian ballistic missile attack, though officials said no such assault is imminent, per France 24.

Why it matters: Patriot is NATO's primary shield against ballistic missiles. A depleted interceptor stock is a capability gap that can't close quickly, because interceptor production runs on a multi-year cycle.

Citing the shortage, UNITED24 Media reported NATO could face what it called "punch after punch" in a Russian missile attack.

Hypothesis: the timing compounds pressure on NATO because it coincides with elevated Russia-NATO tension along the alliance's eastern flank. Supporting this: officials link the shortage to reduced capacity to counter a Russian strike, per France 24. Against this: the same officials say an attack is not imminent, suggesting the gap is a standing vulnerability rather than a response to an active threat.

What to watch: whether Washington prioritizes interceptor shipments to European stockpiles over other theaters, and whether NATO allies announce joint measures to accelerate Patriot production or share existing stocks.