Turkey tests Russian-made S-400 systems: sources

A military aircraft is seen during the radar systems testing of Russian-made S-400 anti-missile defense systems in Ankara, Turkey, on Nov. 25, 2019. Turkey on Monday and Tuesday would be testing the radar systems of Russian-made S-400 anti-missile defense systems in capital Ankara, sources from the Turkish Defense Industries Directorate told Xinhua. (Xinhua)