The U.S. military struck three sites in Iran early Sunday, directly joining Israel ’s war aimed at decapitating the country’s nuclear program in a risky gambit to weaken a longtime foe amid Tehran’s threat of reprisals that could spark a wider regional conflict.

The United States has entered Israel’s war against Iran. American warplanes dropped bombs on three nuclear sites in Iran, President Trump announced on Saturday night, bringing the U.S. military directly into the war after days of uncertainty about whether he would intervene.