The US government announced the imposition of sanctions on Turkey's defence acquisition organisation on 14 December 2020 under the Countering America's Adversaries Through Sanctions Act (CAATSA) over the Turkish acquisition of the Russian S-400 (SA-21 'Growler') air-defence system. Under the sanctions Washington is targeting Turkey's defence procurement organisation: the Presidency of Defence Industries (SSB). Blocking sanctions and visa restrictions through the Department of the Treasury's Specially Designated Nationals and Blocked Persons (SDN) List were also announced against the SSB's president: Ismail Demir. Senior SSB personnel, including SSB vice-president Faruk Yigit, the head of the SSB's air-defence and space department, Serhat Gencoglu, and the programme manager for the SSB's regional air-defence systems directorate, Mustafa Alper Deniz, were also added to the SDN list. Through the SDN listing all property and property interests within the United States are blocked and US persons are generally prohibited from transacting with them.
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