The S-400 air defence system from Russia is activated for testing at Turkish Air Force's Murdet Air Base on November 25, 2019 in Ankara. Getty Images
The S-400 air defence system from Russia is activated for testing at Turkish Air Force's Murdet Air Base on November 25, 2019 in Ankara. Getty Images
Turkey and Russia 'very close' to second missile defence deal
The purchase of the first systems triggered a crisis with Washington that could still sanction Ankara
