Sukhoi is a company that makes fighter jets for the Russian Air Force, and other countries like China. Sukhoi has made some of the world's most innovative aircraft, such as the Su-37 Super Flanker. Most of Sukhoi's shareholdings belong in other countries than Russia.
The United States has bought aircraft from Sukhoi for aggressive training operations. However, Sukhoi sold aircraft to Iran, and thus the United States banned Sukhoi from ever doing business with them again.