Also the US does not intervene to save Germany,they negotiate a German leaning peace that gets the reich in their sphere of influence there is quite a difference there that gets forgotten a lot.
The Reich, unless it's actually disintegrated into civil war, is a
major nuclear power no matter how badly it might be doing economically and politically. At
most it might follow America's lead for a few decades before breaking away, like Russia did IOTL after the end of the Cold War. By comparison, Russia has been devastated by years of war and won't be a credible peer competitor to the United States for decades, kind of like China during the actual Cold War. Unless Russia has been unified by one of the really crazy unifiers, there's no real reason for the United States to negotiate
any kind of German-leaning peace deal.
Losing Russian Friendship by defending the continued occupation of eastern Europe by Germany is still a very harsh departure IMO of 1962 America.
Again, as you say, it may be more nuanced than that in universe, but it still seems to me counter intuitive when America may have spent millions rebuilding Russia to counter Germany.
Or even billions, if you really hammer those decisions.
Especially if Russia is democratic or united under one of the weaker regimes (or both), there's really no reason for the United States to try to get the Reich "into its sphere of influence". Russia has far more natural resources than Germany (e.g., oil) and under many (or even most) possible unifiers is going to be pretty open to large-scale American investment in order to overcome the damage that years of warlordism did. Even after it unifies and develops a nuclear program, it is still going to be a clearly secondary or tertiary power, whereas the Reich is at least going to remember itself being a superpower and try to reclaim that status until it actually falls apart or completely reforms internally. There is just a lot more to gain from the United States making friends with the Russians than with the Germans. Now, in the long run could Russian-American tensions become a problem? Sure, but probably not until the 2000s or beyond, and by then China is probably another big issue for both of them that will help keep them together.
At most, I could see the United States stepping in to mediate if things are getting close to a nuclear war between Russia and Germany, especially if Japan is preoccupied with the Great Asian War and/or Kishi's nonsense. But this would probably be more to avoid, you know, global thermonuclear war while propping up Russia as much as possible as a credible competitor with Germany than to try to "pull Germany into its sphere," which would be about as believable as the United States putting the Soviet Union in its sphere in the 1970s IOTL.