Stalin never believed that Hitler died in Berlin, and brought the only two Germans who claimed to have seen the bodies of Hitler and Eva Braun back to Moscow and tortured them endlessly to seek to find the truth. All that happened is that those two Germans changed the details of their stories, but couldn't say how Hitler escaped because they didn't know. Stalin always thought the US would form an alliance with Nazis after the war to oppose communism, and that preserving Hitler would be a part of that. He was right.
Finally in 2009 the Russian government allowed independent testing of the skull it claimed was that of Hitler.
The results were that the skull was that of a woman.
Since 1945 there has never been any evidence of Hitler's death in Berlin except for the Soviet narrative, weak as it was, and now the testing of the skull has destroyed even that.
The truth is that Hitler, Borman, and hundreds of others escaped to Argentina through the now well-documented "rat line" which was operated by US intelligence in cooperation with the Vatican and other pro-facist elements in Italy after 1945.
The FBI kept receiving claims of sightings of Hitler and others in Argentina, and as a result of this Hitler was moved by CIA assets from Argentina to Indonesia just after the coup there in 1965.
Hitler remained in Indonesia until his death in 1970 where he is buried.