Turkey: U.S. Sanctions Under the Countering America's Adversaries Through Sanctions Act (CAATSA) [December 16, 2020] [open pdf - 853KB]
From the Document: "Turkey's July 2019 acquisition of an S-400 surface-to-air defense system from Russia sparked debate about possible U.S. sanctions against Turkey--a longtime NATO ally--under the Countering America's Adversaries Through Sanctions Act (CAATSA, P.L. 115-44). CAATSA requires the President to impose sanctions on those persons he determines have knowingly engaged in a 'significant transaction' with Russia's security sector. On December 14, 2020, the Administration imposed the following sanctions on Turkey's defense procurement agency, commonly referred to by the Turkish acronym SSB [Savunma Sanayii Başkanlığı]:  a prohibition on granting specific U.S. export licenses and authorizations for any goods or technology;  a prohibition on loans or credits by U.S. financial institutions totaling more than $10 million in any 12-month period;  a ban on U.S. Export-Import Bank assistance;  a requirement for the United States to oppose loans benefitting SSB by international financial institutions; and  full blocking sanctions and visa restrictions on four SSB officials."
CRS Insight, IN11557
Congressional Research Service: https://crsreports.congress.gov/