Secretary of State Mike Pompeo announces that the United States has imposed sanctions on Turkey over its acquisition of the S-400 missile defense system from Russia. This move is the first time that the CAATSA has been used to penalize a U.S. ally.
Turkish air strikes kill 18 Kurdish YPG fighters and media officials in northeastern Syria. Also five Peshmerga fighters are killed during a Turkish attack on Sinjar in Iraq. Turkey also claims to have destroyed "terror hubs". Iraq denounces the strike as a violation of its sovereignty.