Turkey says delivery of second S-400 battery complete

FILE PHOTO: A view shows a new S-400 "Triumph" surface-to-air missile system after its deployment at a military base outside the town of Gvardeysk near Kaliningrad, Russia March 11, 2019. REUTERS/Vitaly Nevar/File Photo

ANKARA (Reuters) - Turkey's defence ministry said on Sunday that the delivery of a second battery of Russian S-400 missile defence systems has been completed as of Sunday, and added that the systems would become active in April 2020.

Ankara and Washington have been at loggerheads over Turkey's purchase of the S-400 systems, which the United States says are not compatible with NATO defences and poses a threat to Lockheed Martin's F-35 'stealth' fighter jets.