Moscow and Ankara have signed a $2.5-billion credit agreement on the purchase of S-400 air defense missile systems from Russia, according to Turkish media. The move previously caused concern of Turkey’s NATO partners. FILE PHOTO: Russian S-400 Triumf missile systems © Paul Gypteau / AFP The deal was signed in the Turkish capital, Ankara on … Continue reading Blow to NATO? Moscow & Ankara sign S-400 air defense system deal, Turkish media report