Jets will be around but I´m sceptical about the B-36 and most sceptical about nukes. Who on earth would spend billions to develop a weapon that might not even work in the end and why? With no WW2, the USSR would be literally in a cold war with the rest of the world. The capitalist camp would uttlerly overmatch the lone USSR.
Since there is no such thing as M.A.D. in the 1940.`s, there is a chance Stalin will do the exact same thing he did in Red Alert.