MOSCOW (Reuters) - Russian President Vladimir Putin and Turkey’s Tayyip Erdogan discussed by phone on July 6 the supply of Russian S-400 defense systems to Turkey as a deal that is in the process of being implemented, the Kremlin said on Monday.

The United States has said that U.S. sanctions would be triggered when the Russian missile batteries arrive in NATO ally Turkey. The first of the defense systems that Ankara has purchased will arrive in Turkey some time this week, privately-held broadcaster Haberturk reported on Friday.

Reporting by Tom Balmforth; Editing by Catherine Evans