In the early hours of February 28, 2026, the United States and Israel executed a coordinated military offensive deep into Iranian territory, marking an unprecedented escalation in Washington’s direct confrontation with Tehran and potentially the most consequential gamble of President Donald Trump’s political career. American and Israeli forces struck military and nuclear infrastructure across the Islamic Republic, including the reported killing of Supreme Leader Ayatollah Ali Khamenei, and initiated what the White House termed “Operation Epic Fury”, a campaign said to be designed to degrade Iran’s strategic capabilities and, in official rhetoric, prevent a future nuclear threat. The strikes represent not just a continuation of the long simmering Israel-Iran conflict but a shift in the intensity and ambition of U.S. foreign policy, a departure with profound legal, geopolitical and economic implications.
The rapid escalation has left international experts and legal scholars grappling with the “known unknowns” of this intervention, beginning with the ostensible legal justification for the attack. Under international law, the use of force by one state against another is prohibited unless exercised in self-defence against an imminent threat, authorised by the United Nations Security Council, or done with the consent of the target state. The Trump administration has claimed that the strikes were pre-emptive, asserting that intelligence indicated Iran was poised to attack U.S. forces and allies in the region. Secretary of State Marco Rubio suggested that Washington acted in anticipation of Iranian retaliation to an Israeli offensive, implying that the United States sought to absorb or forestall a blow predicted to be directed at American personnel. Yet critics argue that the evidentiary threshold for an imminent attack, as required under Article 51 of the UN Charter, has not been publicly demonstrated, raising questions about the legality of the U.S. action under customary international law.
Another unresolved issue is the nature and objective of the campaign. Official statements from the White House have varied, creating strategic ambiguity that obscures Trump’s endgame. At one stage, the president suggested the objective was to destroy Iran’s missile capabilities, cripple its navy and air defences, and ensure that the regime could not arm or fund proxy forces abroad, a combination of goals that blends defensive posturing with regime punishment. At other times, Trump has appealed to the notion of regime change or “regime weakening”, while his defence secretary has insisted the conflict is not formally about overthrowing Tehran’s government. This ambiguity matters: without a clear strategic objective, the risk of mission creep, where tactical military operations expand into broader and unintended conflict increases dramatically on the ground, as does the risk of violating both domestic constitutional requirements and international norms governing declarations of war. The targeting of Iran’s leadership and military infrastructure in such a dramatic manner raises further questions about proportionality and civilian harm under international humanitarian law. Iran’s missile and drone arsenal, its proxy networks in Iraq, Lebanon and Yemen, and its asymmetric warfare capacities mean that any attack on its critical infrastructure will almost certainly provoke significant retaliation. Iran’s response has already included missile and drone strikes against U.S. bases and Gulf states hosting American troops, and proxy actions that extend the battlefield beyond Iranian territory. Such dynamics illustrate the danger inherent in attempting to achieve strategic objectives through overwhelming force without adequately accounting for asymmetric retaliation.
The economic consequences of the conflict underscore another profound unknown in the president’s gamble. The Strait of Hormuz, through which a significant percentage of the world’s oil supply transits, has become a flashpoint with shipping traffic severely disrupted, contributing to sharp increases in global oil prices and renewed volatility in energy markets. Analysts estimate that oil price premiums could rise substantially if disruption persists, while global markets brace for inflationary pressures and supply chain dislocations triggered by the conflict. Such economic consequences reverberate far beyond the immediate combatants and raise the spectre of destabilising effects on global growth, inflation trends and the viability of international economic recovery following the Covid nineteen pandemic and other geopolitical shocks.
The domestic political implications are equally complex and fraught. President Trump, who entered office promising to avoid “stupid foreign wars”, now presides over what critics describe as the most serious military engagement involving U.S. forces since the invasion of Iraq in 2003. The invocation of war powers has prompted debate about the constitutionality of military authorisation without express congressional consent, a cornerstone of U.S. governance designed to balance executive and legislative powers. Legal experts contend that prolonged military engagement without clear congressional authorisation undermines the constitutional framework and sets a dangerous precedent for future U.S. engagements abroad, diluting democratic oversight over matters of war and peace.
Iran’s internal political dynamics add another layer of unpredictability. The removal of Ayatollah Khamenei, if confirmed, creates a power vacuum within the complex structure of the Islamic Republic, where clerical authorities, Revolutionary Guard commanders and political factions compete for influence. In such a volatile environment, new leaders may feel compelled to adopt hardline postures in the face of external aggression, exacerbating tensions and reducing the possibilities for diplomatic de-escalation. Political fragmentation could even increase the likelihood of miscalculation or uncoordinated acts of retaliation, further broadening the conflict.
Regionally, the conflict threatens to draw in additional actors and widen the theatre of hostilities. Proxy groups aligned with Iran, such as Hezbollah in Lebanon and Shia militias in Iraq, possess the capability to launch attacks against Israeli and U.S. positions, potentially prompting state responses that escalate the tempo of war. The presence of U.S. military assets across the Gulf states, combined with Iran’s capacity for missile and drone delivery systems, cyber operations and maritime leverage around the Strait of Hormuz, creates a multi-dimensional battlefield that defies easy containment. The international legal order is under strain as the conflict unfolds. Calls for de-escalation from the United Nations Security Council and other global actors highlight the risks of unrestrained use of force, while criticism from legal scholars points to the necessity of upholding norms against aggression. The fact that the conflict has triggered airspace closures across multiple Gulf states and disrupted civilian aviation underscores how state sovereignty and international civil aviation rights are caught in the crossfire of geopolitical confrontation, raising questions about the adequacy of existing legal protections when confronted with modern warfare realities.
Perhaps the most disquieting unknown and the one that makes this episode potentially the biggest gamble of Trump’s career, is what comes next. History shows that air strikes alone, even when tactically successful, rarely produce strategic resolutions. The collapse of the 2015 Iran nuclear deal after the U.S. withdrawal in 2018 contributed to the very expansion of Iran’s enrichment activities that the latest strikes claim to address. Experts warn that if Tehran survives the current onslaught without capitulation, the war could drive it closer either to clandestine nuclear development or to a posture of nuclear deterrence reminiscent of other proliferated states, further destabilising the non-proliferation regime.
The known unknowns of Trump’s war with Iran encompass legal justifications, strategic clarity, economic repercussions, regional escalation risks and the internal dynamics of the Iranian state itself. This conflict places at stake not only the lives of combatants and civilians caught in the crossfire but also the foundational principles of international law, the balance of powers in U.S. government, and the stability of a region that has long been central to global energy supply and geopolitical equilibrium. The gamble is immense. The outcome remains uncertain. And the world will be left to judge whether a presidency that promised restraint instead chose an audacious and perilous path into the heart of the Middle East’s most enduring conflict.