How the Iran war became a test of American credibility
What happened
The U.S.-Israeli strikes against Iran began on 28 February 2026, one day after Oman-mediated talks ended, and major combat continued until a Pakistan-brokered ceasefire on 8 April after nearly six weeks of war. Since then, the ceasefire has held only fitfully: Washington and Tehran have still exchanged fire, messages have continued through Pakistani mediation, and the latest U.S. position remains that any durable settlement must reopen the Strait of Hormuz without Iranian tolls or veto power.
Washington’s public case for war mixed a real nuclear concern with disputed claims of imminence. Before the war, the IAEA reported that Iran still possessed 440.9 kg of uranium enriched to 60% and that the agency could not fully verify some affected facilities because access was missing. At the same time, Reuters reported that U.S. intelligence did not show Iran was about to attack American forces first, undercutting part of the administration’s public justification. IAEA Director General Rafael Grossi responded by saying that diplomacy remained the only durable way to ensure Iran did not acquire a nuclear weapon.
The way Washington fought
Militarily, the opening was anything but hesitant. General Dan Caine said the final order went out on 27 February; cyber and space units moved first; then more than 100 aircraft launched a synchronised wave on 28 February, and more than 1,000 targets were hit in the first 24 hours. CENTCOM said the targets included IRGC command-and-control sites, air defences, missile and drone launch sites, and military airfields, calling the campaign the largest regional concentration of American military firepower in a generation.
The campaign also had a coercive-maritime layer. The early strikes killed Iran’s supreme leader and other top officials; later, the United States imposed a blockade on traffic entering or leaving Iranian ports after Iran closed the Strait; and in May CENTCOM said it escorted destroyers through Hormuz and struck launch sites after Iranian missiles, drones and small boats attacked the transit. This was not a paper war. By 5 April, 13 U.S. service members had been killed and more than 300 wounded, while a downed F-15 forced a major rescue mission deep inside Iran.
That matters because it clears away one easy misunderstanding. The United States did not look weak because it failed to hit Iran. It hit Iran very hard. The problem is that tactical violence and strategic success turned out to be two different things. Even after repeated bombardment, Iran still had bargaining power, still had a grip on Hormuz, and still had not accepted the political terms Washington wanted.
Why the pressure campaign lost leverage
The main reason is that battlefield damage did not produce a political decision. CSIS analysts argue that Washington entered the war with broad and shifting goals: stopping the nuclear programme, degrading missiles, curbing Iran’s regional reach, and at least implicitly encouraging regime change. By the ceasefire, Iran’s system was bloodied but still in place; Reuters reported that hardliners looked more entrenched, the Strait closure had become a real deterrent, and Iran still possessed more than 400 kg of highly enriched uranium. The IAEA, meanwhile, was still unable to provide assurances about non-diversion at affected sites.
Iran’s real counterstroke was economic rather than symmetrical. The Strait of Hormuz normally handles more than one-quarter of global seaborne oil trade and about one-fifth of world oil and petroleum product consumption, according to the U.S. Energy Information Administration. By late May, Reuters reported that daily traffic had fallen from a pre-war 125–140 vessels to roughly 10, and ADNOC’s chief said full flows might not return until the first half of 2027 even if the conflict ended immediately. In practical terms, Iran found a way to make the costs of continued U.S. pressure visible to the whole world, not just to the Pentagon.
That shock translated into American political limits. Reuters reported in April that the war had exposed Trump’s economic pressure point, with higher petrol prices, inflation worries, and falling approval ratings pushing Washington towards a deal. A Reuters/Ipsos poll later found that two out of three Americans thought Trump had not clearly explained why the country went to war. In other words, U.S. military power remained formidable, but the White House’s willingness to keep paying the domestic price of using that power looked finite.
That is why the post-ceasefire pattern has mattered so much. Trump has repeatedly escalated his language — calling Iranian proposals “garbage”, saying the ceasefire was “on life support”, claiming he was an hour away from a new strike, giving deadlines of “two or three days” or “a few days”, and then pausing again after a new Iranian proposal and appeals from Gulf leaders. Limited U.S. retaliatory strikes did resume on 7 May, so it is wrong to say Washington did nothing; but it has not returned to the kind of large-scale campaign it keeps threatening. For Tehran, the lesson is obvious: American threats are real, but American deadlines are negotiable.
This is the credibility problem. Chatham House and Reuters analysts have both argued that the United States has not looked militarily incapable; it has looked politically unwilling to pay the full price of turning tactical dominance into strategic control. In coercive diplomacy, that distinction is crucial. If the other side believes you can hit, but not sustain the consequences of hitting, time starts to favour the defender.
What allies are seeing
Traditional allies noticed early that this was not a broad-coalition war. Indeed, allies were not even consulted prior to the start of military action. When Washington finally asked for help securing Hormuz, Japan said it had made no decision to send escort ships, Australia said it would not send a naval vessel, Britain said it would not be drawn into the wider war, and Germany openly questioned what a handful of European frigates could do that the U.S. Navy could not. That is not how allies behave when they are convinced the strategy is clear, lawful, and likely to end on acceptable terms.
Since then, the credibility strain has widened into alliance management. Reuters reported in May that some U.S. partners were already hedging, while European governments were stepping up efforts to cooperate more closely together and reduce reliance on Washington. Chatham House likewise argued that the war and the administration’s erratic conduct had made traditional Atlantic assumptions less tenable for Britain and other Europeans. A separate international survey reported by Reuters found that net perceptions of the United States had fallen below those of Russia, with the Iran war and the oil-price shock among the factors unsettling transatlantic relations.
The Gulf states have their own reason to worry. Reuters reported that they oppose any settlement that leaves Iran able to control or police Hormuz, because the waterway is their economic lifeline. Another Reuters survey of regional effects found that the war has raised deeper questions in Saudi Arabia and elsewhere about long-term reliance on the United States as the region’s security anchor. For partners that depend on Washington, the unsettling message is not that America cannot fight; it is that America may fight first and negotiate later, leaving its friends to absorb much of the economic fallout.
The spillover reached Asia as well. In early March, Reuters reported that lawmakers and officials in Tokyo and Taipei were asking the same question: what happens if ships, missiles and munitions needed to deter China are pulled into the Middle East? Later, U.S. officials insisted the Iran war had not delayed weapons shipments to Taiwan, and the Philippines publicly said it was not worried about reduced deterrence. But even Manila warned that China is exactly the kind of power that would test any perceived opening. The fact that these reassurances had to be made at all shows how quickly a Middle Eastern war can become a credibility issue in the Indo-Pacific.
What rivals are learning
For Tehran, the war has become a proof-of-concept for endurance. Reuters’ reporting from mid-May describes a deadlock in which both sides think time favours them, but Iran’s internal view is especially telling: officials told Reuters that missiles, enriched uranium and control of Hormuz are not ordinary bargaining chips but pillars of regime survival, and one Iranian official said Tehran believed it had already “won” by refusing to submit. So long as Washington talks like a state seeking capitulation but behaves like a state seeking an exit, Iran has every incentive to wait for better terms.
China’s reading is subtler but no less consequential. Reuters reported that the war has diverted American diplomatic and military attention away from the Indo-Pacific, and that Beijing has little incentive to press Iran into major concessions because Tehran remains a strategic counterweight to the United States. Around Xi Jinping, the optics have been useful: Reuters quoted a Brookings analyst saying Xi appeared to hold the stronger position because both Trump and Putin were wrestling with wars of their own, while Xi could project stability and confidence. CSIS analysts go further, arguing that Beijing is studying both the political limits of U.S. power and the way cheap asymmetric tools can tie down a superpower at a strategic chokepoint.
Russia benefits from the same distraction. Reuters reported that any prolonged Iran conflict could worsen shortages of Patriot interceptors and other systems already vital to Ukraine. At the same time, Xi and Putin used their Beijing summit to accuse the United States and Israel of violating international law and to warn that the world was drifting back towards the “law of the jungle”. Moscow does not need to defeat Washington directly to profit from this situation; it only needs the United States to split attention, spend munitions and look less able to impose outcomes cleanly.
North Korea may draw the starkest lesson of all. Reuters reported in March that experts and former officials believe the strikes on Iran will reinforce Kim Jong Un’s nuclear ambitions. The implied logic is grim but straightforward: if Iran, with a threshold nuclear programme but no bomb, could be attacked in this way, Pyongyang has every reason to treat an operational nuclear deterrent as insurance rather than bargaining stock. That means the Iran war may have made one of Washington’s hardest future non-proliferation problems even harder.
The larger consequence
The sharpest conclusion is also the simplest. This war has not shown that the United States is weak in raw military terms. CENTCOM has demonstrated that it can strike targets across Iran, defend warships, enforce a blockade and damage large parts of Iran’s defence-industrial base. What the war has shown is something different: American power is easier to use destructively than politically. Destroying assets is not the same as compelling an adversary to accept your terms once that adversary has found a lever — in this case Hormuz — that raises the cost of escalation for you.
That distinction matters because deterrence and compellence are, in part, arguments about perception. Allies do not need to believe that America has become powerless; they only need to believe that its commitments are increasingly contingent, improvised and vulnerable to economic pain. Rivals do not need to believe they can defeat the United States in a straight fight; they only need to believe they can outlast American political patience or exploit openings elsewhere. On that measure, the Iran war has already imposed costs reaching far beyond Iran itself.
As of 21 May 2026, the diplomatic track is still alive, even though Washington says an Iranian tolling regime in Hormuz would be a deal-breaker and Tehran has hardened its stance on sending enriched uranium abroad. But if the talks fail, the most enduring image of this war may not be the opening bombardment. It may be a superpower that struck first and struck hard, then discovered that threats, unless they are either followed through or translated into a believable settlement, can make an opponent more defiant rather than more compliant.
This is a lesson both allies and enemies are learning. The United States is showing itself unwilling to follow through with threats, its aversion for war outweighing its willingness to prosecute one.
