Anti-western sentiment has risen dramatically in Turkey after the botched coup while relations with Russia have warmed, driven by the personal friendship between Erdogan and President Vladimir Putin.

"The S-400 is more sophisticated and advanced compared to the Patriot 3 that the U.S. is offering, but will Turkey intend to accept in her bedroom a stranger that can hear or see all her confidential?" said Eksi, also arguing that with a possible transfer of know-how, the Russian system could prove more costly than predicted.

The sides are currently sorting out various technical details and it could take about one year to finalize the project, according to Turkish sources.

Disagreements between Turkey, which has the second-largest army by personnel numbers in NATO, and the west have precipitated a rapprochement with Russia, despite of differences over the war in Syria.

Analysts underline the need for Turkey to diversify its military arsenal and say that with a single purchase Turkey is not committing itself away from NATO and from its responsibilities inside the alliance.

"Turkey is located at the gates of several armed conflicts in a volatile region and has justified concerns for its national security, and despite being a NATO member she is not obligated to buy from specific countries alone," professor Mustafa Kibaroglu, director of the Center for international security studies and strategic research at MEF University in Istanbul told cnn Turk news channel.

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