S-400 missile system
The Turkish Defense Ministry on Wednesday said that training has commenced on the controversial Russian S-400 missile defense system that has soured Ankara's ties with Washington and raised tension with Athens.
In a post on Twitter, the minister said that training on the long-range air and missile defense system has started in Gatchina, Russia.
Turkish President Recep Tayyip Erdogan and Russian President Vladimir have underscored their close links as they opened a major Russian air show.
Erdogan was Putin's guest of honor on Tuesday at the opening of the MAKS aviation show outside Moscow and even got to peek inside the cockpit of Russia's newest fighter jet, the Su-57, which was unveiled at the show.
The Turkish defense minister says Russia will resume the delivery of its S-400 missile defense system to Turkey this week.
Turkey took delivery of the first part of the Russian system last month despite strong objections from the United States, which had been pressing Turkey to cancel the deal with Russia and has threatened sanctions against Turkey.