Turkey Threaten to Retaliate if U.S. Imposes Sanctions over Acquisition of Russian S-400 Missile Defenses

Turkey has threatened to retaliate if U.S. imposes sanctions on Ankara over it latest acquisitions of S-400 missile defenses from Russia.  Turkish foreign minister termed U.S. sanctions threats as unacceptable and called on President Donald Trump to avoid such measures. Ankara began receiving deliveries of the surface-to-air S-400 systems earlier this month. U.S. in turn...