Truman continued to use the bomb as a threat to force Soviet concessions. He felt he did so successfully in Iran just seven months after Hiroshima and Nagasaki. The Russian army was prolonging a wartime occupation in northern Iran, seeking Soviet oil leases like those of the British in the south. Truman later told Senator Henry Jackson that he had summoned Soviet Ambassador Andrei Gromyko to the White House. The president demanded that the Russian troops evacuate Iran within forty-eight hours or the United States would use the atomic
