MOSCOW (AP) — President Vladimir Putin says National Security Agency leaker Edward Snowden has been warned against taking any actions that would damage relations between Moscow and Washington.

Snowden has applied for temporary asylum in Russia, three weeks after arriving at a Moscow airport from Hong Kong. The United States wants him sent home to face prosecution for espionage.

Granting Snowden asylum would add new tensions to U.S.-Russian relations already strained by criticism of Russia's pressure on opposition groups, Moscow's suspicion of U.S. missile-defense plans and Russia's resistance to sanctions against the regime of Syrian President Bashar Assad.