Ahmet Berat Conkar, head of the Turkish delegation to NATO Parliamentary Assembly, said the purchase of the S-400 anti-aircraft missiles was solely based on technical and financial reasons.
"Turkey's picked S-400 over other options because the missile system possesses more advanced technical features than its rivals, with a better price and shorter delivery time," Conkar, who is a member of parliament for the ruling AK party, told Al Jazeera.
His comments came after Nurettin Canikli, Turkey's defense minister, said on Saturday that the S-400 deal with Russia was "done".
"The S-400 missiles are purchased. Only small details are left to handle at this point," Canikli told reporters in the northern city of Giresun.
Russia's S-400 is an advanced anti-aircraft surface-to-air defense system that has been imported to various countries.
In the bidding process, before agreeing on buying the S-400, Turkey - which is a NATO member and hosts a base for the military alliance - had also considered US defense contractor Raytheon's Patriot system.
Since its announcement last summer, the Turkish-Russian deal has been viewed with suspicion in NATO circles, as the Russian-made equipment is believed to be incompatible with the systems used by the alliance.
General Petr Pavel, the chairman of NATO's Military Committee, had recently warned Turkey about the consequences of a possible S-400 purchase from Russia.
"The principal of sovereignty obviously exists in acquisition of defense equipment, but the same way that nations are sovereign in making their decision, they are also sovereign in facing the consequences of that decision," Pavel told reporters in Washington, DC, on October 25.
Defense officials in the United States have also expressed concern over the purchase agreement multiple times.
According to NATO's policy, "interoperability does not necessarily require common military equipment. What is important is that this equipment can share common facilities and is able to communicate with other equipment".
But Conkar said he believed the purchase would not affect Turkey's cooperation within NATO and its participation in the alliance's activities.
"There are other countries who have bought weapon systems from third countries. NATO projects and actions are carried out through a planning process that would not interfere with Turkey's other defense investments," he told Al Jazeera.
The cost of the Russia-Turkey S-400 deal is more than $2bn, according to the CEO of the Russia's state-run defense company Rostec, quoted by official TASS news agency.
Turkey, which has been relying on Patriot batteries from NATO allies for its air defense, has been seeking to have its own system for some years now.
In 2012, Ankara requested air defense support against threats posed by missiles from across its border with war-torn Syria.
Responding to the request, NATO allies Germany, Italy, Spain, the Netherlands and the US in January 2013 contributed missile batteries to augment Turkey's air defense, according to official NATO records.
But the vast majority of the air defense batteries were withdrawn in 2015, despite Ankara's concerns over the security of its border.
Currently, Spain and Italy provide one Patriot missile battery and one ASTER SAMP/T battery each for Turkey's air defense respectively.
In a separate development, Ankara last week signed a letter of intent with France and Italy to cooperate with these countries in order to develop a new missile defense system, according to Canikli, the defense minister.
"In addition to the S-400 deal, Turkey also made preliminary agreements with the Eurosam countries to develop, produce and use the air defense system in order to improve its long-term domestic national capacity," said Canikli, adding that Ankara aims to have its own technology in this area.
Eurosam is a consortium of Italian and French companies set up to develop anti-aircraft defense systems.
Conkar said the Eurosam deal demonstrates that Turkey has no intention of antagonizing its allies through the purchase of S-400 missile systems.
"This development openly reveals that Turkey will work with its allies to develop such systems in the middle and long term. However, it needs the S-400 system for its immediate defense," he told Al Jazeera.