US Vice-President Mike Pence has warned Turkey against buying a Russian S-400 anti-aircraft missile system that Washington sees as a threat to US jets.
Mr. Pence was quoted by the BBC as saying, that Turkey must choose between remaining a key NATO member or risk the security of that partnership -by making such reckless decisions.
Turkey responded that the purchase of the advanced system was a done deal.
Ankara has been establishing closer links with Russia after recent souring of its ties with the US and Europe.
Turkey has the second-largest army in NATO, a 29-member military alliance set up to defend against what was at the time the Soviet Union.
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