Reuters:
ANKARA (Reuters) – Turkey would retaliate against what it called an unacceptable threat of U.S. sanctions over Ankara’s purchase of Russian S-400 missile defenses, its foreign minister said on Monday, adding he thinks President Donald Trump wants to avoid such measures.
Turkey began receiving deliveries of the surface-to-air S-400 systems earlier this month, prompting the United States to begin removing the NATO ally from its F-35 stealth fighter program over security concerns.