The purchase of the surface-to-air missile defence systems from a non-NATO supplier will raise concerns in the West over their compatibility with the alliance's equipment, the Xinhua quoted a report.
"Signatures have been made for the purchase of S-400s from Russia. A deposit has also been paid as far as I know," Turkish President Recep Tayyip Erdogan said in comments published in several newspapers on Tuesday.
"Russian President Vladimir Putin and I are determined on this issue and we take our own decisions," Turkish President Recep Tayyip Erdogan told mediapersons aboard his presidential jet returning from a trip to Kazakhstan.
Erdogan said Turkey was free to make military acquisitions based on its defense needs.
Moscow also confirmed the accord, with Vladimir Kozhin, Putin's adviser for military and technical cooperation, saying: "The contract has been signed and is being prepared for implementation.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)