Russia, the world's largest supplier of enriched uranium, said on November 15 that it had imposed temporary restrictions on the export of enriched uranium to the United States, a symbolic tit-for-tat move after the United States banned Russian uranium imports. Russia holds about 44 percent of the world's uranium-enrichment capacity and about 35 percent of U.S. nuclear fuel imports used to come from Russia, according to the U.S. Office of Nuclear Energy. But in May, President Joe Biden signed into law a ban on Russian enriched uranium, though the United States also has the ability to issue waivers if there are supply concerns.