The U.S. cites concern over Ankara’s plans to purchase the Russian S-400 missile defense systems although other NATO countries had previously procured earlier generation S-300 missiles without this conflicting with their membership in the alliance.
Following protracted efforts to purchase air defense systems from the U.S. with no success, Ankara decided in 2017 to purchase the S-400.
The S-300 system, completed in 1978, is designed to defend against short and medium-range air attacks and is considered one of the world’s most powerful air defense systems.
Russia sold the S-300 system to 20 countries, including NATO member countries such as Bulgaria, Greece and Slovakia.
For details: https://bit.ly/2Z8SiYm