America's Empty Shelves: How the Iran War Quietly Handed Tehran Its Best Negotiating Position in Decades

There's a number in a recent CSIS assessment of the Iran war that deserves more attention than it's gotten: the United States has expended more than half of its available stockpile of at least four critical categories of advanced munitions since the war began in late February. Precision Strike Missiles are down roughly 45 percent. THAAD interceptors are down about half. Patriot air-defense missiles — the interceptors doing the actual work of protecting US bases and Gulf allies from Iranian retaliation — are down close to 50 percent as well. Tomahawks are down around 30 percent, long-range JASSM cruise missiles more than 20 percent. CSIS estimates it will take three or more years to rebuild those inventories to where they stood before the war started, with the slowest-to-replace munition, the Tomahawk, needing four to five years.

Numbers like that usually get discussed as a readiness problem — and it is one, with real strategic consequences for how much the US has left in reserve if a confrontation with a near-peer power like China opened up in the western Pacific while these stockpiles sit depleted. But there's a second, less-discussed dimension to running low on precision interceptors and standoff weapons in the middle of an active war: it changes what you can credibly threaten, which changes what the other side has to concede to end the fighting. A negotiating position backed by an arsenal that can sustain indefinite tempo looks very different from one backed by an arsenal visibly running down in real time, and both sides at the table know how to read inventory numbers.

That shift in underlying leverage helps explain something that's been harder to parse just from public statements: JD Vance's own visible change of tone on Israel and the war over the past two months. Vance has publicly defended the US-Iran interim peace framework reached last month, a deal that has drawn open opposition from parts of Israel's government. More strikingly, he's accused Israeli officials directly of running a campaign to sway US public opinion against a negotiated end to the war, and of pressuring Washington to keep the conflict going rather than let it wind down. Reporting on the shift has described it as the Trump administration signaling, for the first time in a generation, that it isn't willing to treat Israeli objections as an automatic veto over US Middle East policy. That's not a small thing for a sitting vice president to say out loud, and it isn't happening in a vacuum — it's happening while the country he's defending a peace deal for is the one whose war just burned through half of America's precision-guided arsenal.

The domestic political math layers on top of the military math. Republican base sentiment on the war has soured considerably as the human and financial costs have mounted — costs this outlet has covered in detail, from CENTCOM's casualty counts to Harvard's trillion-dollar long-run cost estimate. A war that started with broad if cautious GOP support has, seven months in, become the kind of drag that shows up in approval numbers heading into a midterm cycle where Republicans are already playing defense. Vance's pivot toward publicly criticizing Israeli pressure and defending a negotiated exit reads less like a foreign-policy conversion and more like a politician responding to where his own coalition has moved — a hedge against a war that could cost House and Senate seats in November, and by his own polling, has already cost him ground in the invisible 2028 primary. His lead over Marco Rubio in early 2028 matchup polling reportedly shrank from thirty-two points to a single point within a matter of weeks this spring, a swing too large to attribute to anything other than the war itself.

Put the pieces together and the picture is less about any single dramatic event and more about compounding pressure from several directions at once: an arsenal too depleted to sustain indefinite escalation, a domestic coalition losing patience with the war's costs, and a vice president whose political future depends on being on the right side of both trends before November. None of that guarantees the war ends soon. But it does suggest that whatever ends it — a renegotiated ceasefire, a quiet de-escalation, or continued grinding attrition — is now being shaped as much by what's left in American warehouses and what's showing up in American polling as by anything happening on the ground in Iran.