a nuclear weapon was among the United States ’ top priorities , and in June 2010 Russia signed off on a United Nations resolution imposing tough new sanctions on that country . Two months later , the deal giving ARMZ a controlling stake in Uranium One was submitted to the Committee on Foreign Investment in the United States for review . Because of the secrecy surrounding the process , it is hard to know whether the participants weighed the desire to improve bilateral relations against the potential risks of allowing the Russian government control over the biggest uranium producer in the United States .
U.S. President Barack Obama said in his weekly Saturday address " no terrorist group has yet succeeded in obtainingtransaction.transferownership.purchasea nuclear device or producing a dirty bomb using radioactive materials , " but al - Qaida has tried . The president delivered his address from the Nuclear Security Summit where world leaders gathered to discuss what Obama described as " one of the greatest threats to global security - terrorists getting their hands on a weapon of mass destruction . " Obama says Friday that global efforts to stop terrorists and others from using nuclear weapons are by " no means finished . "