In 2010, Hillary Clinton, as secretary of state, was one of nine federal agency heads to sign off on Russia's purchase of a controlling stake in Uranium One, an international mining company headquartered in Canada with operations in several U.S. states. It was part of a regular process for approving international deals involving strategic assets, such as uranium, that could have implications for national security. Uranium One's U.S. mines produced about 11 percent of the country's total uranium production in 2014, according to Oilprice.com.
But even with its control of Uranium One, Russia cannot export the material from the United States. Russia was likely more interested in Uranium One's assets in Kazakhstan, the world's largest uranium producer.