Moscow - Moscow and Ankara confirmed on Tuesday that they signed a deal in which Moscow would sell Ankara S-400 missiles.
Kalin noted that Turkey is and will remain an important North Atlantic Treaty Organisation ally, Turkish media outlets reported on August 14.
NATO's opposition to Ankara's planned procurement of the Russian air defense system was indicated earlier this summer by US Congress's decision to reject the sale of semi-automatic handguns to Turkish police.
Turkey has been weighing options for acquiring long-range SAMs for years.
It has a 400 kilometre-range and can work with four different types of missiles with different starting weight and launch ranges. An anti-ballistic missile using "hit-to-kill" kinetic velocity to destroy incoming ballistic missiles is now under development.
Turkey ranks 155 on the latest world press freedom index put together by Reporters Sans Frontieres (Reporters Without Borders), falling below Belarus and the Democratic Republic of Congo. Relations further deteriorated following an April referendum which expanded the powers of the president.
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"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.
Turkey said in April that North Atlantic Treaty Organisation ally nations had not presented a "financially effective" offer on alternative missile defence systems.
The official, speaking on the condition of anonymity as required by North Atlantic Treaty Organisation procedures, said that "NATO has not been informed about the details of any purchase".
The Pentagon has already sounded the alarm, saying bluntly that "generally it's a good idea" for North Atlantic Treaty Organisation allies to buy inter-operable equipment.
A North Atlantic Treaty Organisation official said by email that while the alliance does not ban purchases of military hardware from manufacturers outside the alliance, "interoperability of our armed forces is fundamental to North Atlantic Treaty Organisation for the conduct of our operations and missions". Germany has criticized mass arrests, refused to extradite people Turkey says were involved in the putsch and demanded the release of around a dozen German citizens arrested in recent months. "I think Turkey's exports to the European Union will increase further", Ertem said.
The spat has prompted Germany to restrict its arms sales to Turkey.