“Both Moscow and Ankara use this story on the political level to show their respective dissatisfaction to the West,” Delanoe said.
Russia’s relations with NATO have been in crisis over its annexation of Crimea from Ukraine and for backing pro-Moscow separatists in eastern Ukraine.
But while still a key member of NATO, Turkey’s ties with the United States in particular have been strained over Washington’s support of the People’s Protection Units (YPG) Syrian Kurd militia which Ankara considers a terror group.
“Ankara is also tempted to use (the S-400 issue) since it has been deeply frustrated by America’s ongoing military cooperation with the Syrian Kurds,” said Delanoe.
Timur Akhmetov, Ankara-based Turkey expert at the Russian International Affairs Council, said the talks helped Russia promote its arms systems and corrode trust among NATO members, while Turkey wanted to show its Western allies it has a strategic choice in its relationships.
“The longer the talks on the S-400 systems are on the agenda, the better for Russia and Turkey’s respective interests,” he said.
– ‘No trust’ –
The fact the two countries are even discussing the purchase is a rich symbol of the transformation in relations since a reconciliation deal last summer following the shooting down by Turkey of a Russian plane over the Syrian border in November 2015.
Moscow and Ankara remain on opposed sides in the Syrian conflict with Russia backing the Damascus regime and Turkey the rebels.
In 2012, Turkish jets forced a Syrian plane flying from Moscow to Damascus to land at Ankara airport on the grounds it was carrying military equipment, reportedly radar parts for a Syrian air defence system.
The two post-imperial states both show an ability to compartmentalise relations by not letting a centuries old and persistent regional rivalry pollute potentially fruitful, but limited, areas of cooperation.
Yet analysts say talk of the S-400 deal is far short of an indication of a major strategic alliance.
“The only thing that makes both Turkey and Moscow drift to each other is their intention to pressure their own respective relations with the West,” said Akhmetov.
Delanoe said “both partners do not trust each other” but “have built a geoeconomic partnership mainly based on energy” with work in progress on the TurkStream pipeline to pump Russian gas under the Black Sea.
According to a study by Can Kasapoglu of the EDAM centre for economic and foreign policy studies, Turkey’s desire to obtain the weapons is also motivated by its dearth of qualified military pilots due to the purges that followed the July 15, 2016 failed coup which has necessitated an urgent shoring up of air defences.
Were Turkey to get its hands on the S-400 system, it would produce an outcome where NATO members Turkey and Greece were both operating Russian-made weapons, risking the same “vicious circle” that sees Moscow supplying bitter foes Armenia and Azerbaijan, he added.