OFAC, as with the EU and Canada, has imposed sanctions on 6 persons and 8 entities in connection with the seizure of Ukrainian vessels and sailors in November, and defence companies based in Crimea, or involved in Crimea. Also designated are 2 Ukrainian separatists who were involved in the organisation of the November 2018 elections in the so-called Donetsk People’s Republic.
https://www.treasury.gov/resource-center/sanctions/OFAC-Enforcement/Pages/20190315.aspx