A U.S. senator has asked the Treasury Department whether it has investigated the apparent relationships between U.S.-sanctioned Russian arms makers and Russian-linked U.S. arms manufacturers, including Pompano Beach’s Kalashnikov USA.

“Kalashnikov USA appears to be closely linked to Russian arms manufacturers Kalashnikov Concern,” wrote Sen. Ron Wyden, D-OR, in a July 31 letter to the acting director of the Office of Foreign Assets Control (OFAC). “Kalashnikov USA has already been the subject of at least one Congressional inquiry to the Treasury Department for potentially violating sanctions on Russian arms manufacturers.”

President Obama imposed economic sanctions on Kalashnikov Concern, also known as Concern Kalashnikov, and other Russian arms makers in 2014 in response to the conflict in Ukraine.

Wyden, the minority ranking member of the Senate Finance Committee, also inquired about Texas-based TulAmmo USA, which sells small arms ammunition, and its ties to the Russian manufacturer Tula Cartridge Works, sometimes known as Tula Cartridge Plant.