In 2017, Turkey and Russia signed a deal to supply Ankara with S-400 air missile systems in a bid to deepen military ties between NATO member Turkey and Moscow.

The deal, worth $2.5 billion, has been met with opposition by NATO and the West over the system’s incompatibility with the alliance military system. Washington has demanded for Ankara to abandon the agreement, urging Turkey, in return, to purchase American Patriots.

Turkey took delivery of the first S-400 batch in July last year, prompting Washington to remove Turkey from the F-35 programme, in which Ankara was a manufacturer and buyer.

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