What Are ATACMS Missiles, the U.S. Missiles That Officials Say Ukraine Fired Into Russia?

 Ukraine’s military used American-made ATACMS missiles to strike into Russia for the first time on Tuesday, according to senior U.S. and Ukrainian officials.

Two days earlier, the Biden administration had authorized Ukraine to use the U.S.-supplied ballistic missiles for attacks inside Russia for the first time, in a major policy shift.

The ballistic missiles are known as the Army Tactical Missile Systems, or ATACMS (pronounced “attack ’ems”).

Ukraine has been lobbying the United States for years to receive the authorization, which comes in the final months of the Biden administration. President-elect Donald J. Trump has said he will seek a quick end to the war in Ukraine.