Washington, D.C., United States—The American government has imposed sanctions on the Chinese military over an order of Russian anti-air missiles and aircraft.

The sanctions came because of a twin Chinese purchase of 10 Russian Sukhoi Su-35 fighter jets in 2017 and batteries of S-400 surface-to-air missiles in early 2018. The State Department announced that the sanctions would specifically target China’s Equipment Development Department (EDD), the military agency responsible for weapons and equipment purchases, and its director, Li Shangfu.

US officials have said the sanctions are aimed at Russia and are not intended to undermine other countries’ defense capabilities, and similar action against other countries could be considered.

The Russian Foreign Minister Sergei Lavrov described the sanctions as economic warfare and “yet another act of unfair competition.”