Russia deployed the S-400 at its Syrian air force base near Latakia in December 2015, after Turkish military jets downed a Russian Su-24 warplane along the Syria-Turkey border, the BBC News said. Last year Ankara announced that it was in talks with Russian Federation over a potential purchase of the S-400.
"We make the decisions about our own independence ourselves, we are obliged to take safety and security measures in order to defend our country", he said.
In the clearest sign of his pivot towards Russia and away from North Atlantic Treaty Organisation and the West, Turkish President Recep Tayyip Erdogan announced that Turkey has signed a deal to purchase a Russian surface-to-air missile system. "What were we supposed to do, wait for you?" the Turkish head of state said during a speech in Ankara on Wednesday.
Turkey, whose relations with its allies have frayed in recent months, said it opted for the S-400 because Western companies had offered no "financially effective" alternative.
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Turkey has been developing stronger ties with Russian Federation and souring on its relationship with the United States, which has supported the YPG Syrian Kurdish rebels during the Syrian civil war, the BBC News reported. And we'll be manufacturing other, better things.
In July, Bloomberg reported that Ankara and Moscow agreed to a $2.5 billion USA contract for four S-400 systems.
"We have relayed our concerns to Turkish officials regarding the potential purchase of the S-400", Pentagon spokesman Johnny Michael told CNBC in a written statement on September 12. The deal is said to be worth around $2.5 billion.
The S-400 is Russia's most advanced long-range anti-aircraft missile system and can carry three types of missiles capable of destroying targets including ballistic and cruise missiles. He was referencing the USA decision to arm the Kurdish YPG for the fight against ISIS in Syria, despite fierce protest by Turkey.