Why did the US and Israel strike Iran?

What happened and the immediate rationale

U.S. and Israeli forces carried out coordinated strikes against Iranian targets after the administration concluded that recent Iranian activity posed an unacceptable risk to regional partners and U.S. interests. The White House framed the operation as a calibrated response aimed at degrading Iran’s missile and weapons infrastructure and deterring further attacks against U.S. forces, allies, and merchant shipping in the region.

President Trump described the action as the start of “major combat operations” and demanded that Iran’s armed forces lay down their arms or face severe consequences. British and other Western officials moved quickly to review their own positions: the U.K. prime minister convened an emergency COBRA meeting to consider response options, and several governments authorised voluntary departures of non‑essential embassy staff from Israel and nearby posts.

Key, confirmed moves by governments and militaries

• U.S. officials acknowledged participation alongside Israeli strikes, and the Pentagon reallocated assets to the region, including additional aircraft and carrier presence.
• Governments issued travel advisories and prepared evacuation plans for diplomatic personnel and their families.
• Members of Congress pushed for a formal debate about war powers, with Democrats demanding a vote to require the administration to justify any sustained military campaign.

What remains unclear or unfolding

It is still unclear how extensive the damage to Iranian capabilities will be, how Tehran will retaliate, and whether the strikes will expand into a longer campaign. Diplomatic channels continue: negotiators from the U.S. and Iran were reported to be meeting in Geneva even as military actions escalated. The coming days will determine whether the strikes achieve a narrow deterrent objective or trigger broader regional conflict.