Not true. The Soviet threat existed already before the WW2. It was actually the main reason why Nazi Germany was able to become that powerful - Britain and France hoped that Germany will balance that Soviet threat out. Eventually it did, but not without huge damages to Britain and France and without substantially aiding Russia. If your claim was true we should have seen huge increase in tensions between France and Germany after the collapse of Soviet Union, but rather the opposite is true.
Russia didn't disappear after the collapse. Germany was utterly defeated in the WW2, occupied by western allies and the soviet union and is demilitarized compared to France. Americans still have military bases there. Its whole existence after WW2 was reshaped by the victors to not be a threat again.
Germany was defeated and was rebuilt and the tools to reshape the European political landscape from within was first ECSC and later European Union. Yes, US military presence works as some stabilizing mechanism but it wouldn't have been enough without European mutual political framework.
EU leaders mistakenly thought that they can have the same success with Russia but they didn't take into account the fact that Russian new president had completely misaligned interests.
