Nato member Turkey apparently ignores arms deals with its partners in the alliance and buys anti-aircraft missiles from the "enemy," leaving Nato perplexed.
Turkey has signed a controversial deal with Russia to arm its forces with Russian S-400 anti-aircraft missiles, the BBC reports.
President Recep Tayyip Erdogan said a deposit had already been paid. The deal is thought to be worth $2.5bn (£1.9bn).
Turkey has the second-largest army in Nato. The alliance reacted sceptically to the decision, saying the system was not compatible with its equipment.
Turkey has been establishing closer links with Russia after its recent souring of ties with the US and Europe.
Mr Erdogan's government objects to US military support for the YPG Syrian Kurdish rebels, who are linked to rebel Kurds in Turkey.
Russia says the S-400 system has a range of 400km (248 miles) and can shoot down up to 80 targets simultaneously, aiming two missiles at each one.
Speaking to AFP news agency, an unnamed Nato official said: "No Nato ally currently operates the S-400". They added: "Nato has not been informed about the details of any purchase."
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