The news of the successful test at Trinity infuriated the Russian dictator Joseph Stalin. He demanded that he get a bomb at once. The KGB had had little success with the Americans, until they met Klaus Fuchs, pronounced like fooks. He was a British Physicist and a soviet supporter. The Manhattan project needed new scientists so the British sent their scientists. Klaus Fuchs was included in the package.
The KGB was ecstatic to hear that they finally had a spy in the Manhattan Project. Joseph Stalin wasn't as pleased. He said he wanted results and if results weren't provided, heads were going to start rolling. The Russians used the American plans give to them by Klaus Fuchs to finally build their own bomb. The war was won and a new one began, the Cold War. The U.S. was surprised and infuriated by the news of the Russians successful test.