The first batch of Russian S-400 air defense systems was delivered in Turkish capital city of Ankara on Friday, the Turkish Defense Ministry said.

Within the purchase contract signed between Turkey and Russia, the first shipment of S-400 arrived at Murted Air Base, formerly called the Akinci Air Base, located in northeastern suburb of Ankara, the ministry said in a written statement.

In December 2017, Ankara and Moscow signed a 2.5-billion-US-dollar agreement for two batteries of the S-400 system, Russia's most advanced long-range anti-aircraft missile system. Turkey is the first NATO member country to acquire the system.