Why did the U.S. strike Iran?

What U.S. and Israeli forces did and why it matters

U.S. and Israeli military forces carried out coordinated strikes inside Iran in an operation the governments described as a major combat campaign aimed at degrading Tehran’s military capabilities and targeting the country’s top leadership. The strikes hit military sites, missile facilities and residences linked to senior officials. Israeli officials reported that Iran’s supreme leader was among those killed; U.S. officials confirmed participation in the strikes and framed the operation as an effort to remove imminent threats and to blunt Iran’s ability to develop and deliver advanced weapons.

The military action has immediately reshaped the diplomatic and security landscape:

• Regional escalation: Iran retaliated with missile and drone attacks across the Middle East and closed key waterways; Gulf states and U.S. partners moved to protect facilities and personnel.
• Political backlash at home: Lawmakers from both parties have split — some praising the action, others condemning an unauthorized use of force and demanding congressional votes to restrain further strikes.
• Humanitarian and practical consequences: Allied governments ordered evacuations of nonessential diplomats, and the U.N. Security Council called emergency sessions to address the growing conflict.

What to watch next

Military planners say a limited strike can be executed quickly, but sustaining a prolonged campaign would strain munitions and logistics and increase the risk of wider war. Congress has signaled it will press for votes on war powers resolutions; courts and foreign capitals are weighing the legality and fallout. On the ground in Iran, the strikes could deepen internal instability and create an uncertain succession and security environment, while internationally the operation has tested alliances and provoked criticism from governments calling for restraint.