Russia is providing Iran with intelligence about the locations and movements of American troops, ships and aircraft, according to multiple people familiar with US intelligence reporting on the issue, the first indication that Moscow has sought to get involved in the war.

Much of the intelligence Russia has shared with Iran has been imagery from Moscow’s sophisticated constellation of overhead satellites, one of the people said. It is not clear what Russia is getting in return for the assistance.

CNN has asked the Kremlin and the Russian embassy in Washington for comment.