The link is a lot stronger in RA1:

Spoiler: Soviet End Cutscene
Show

Stalin's mistress poisons him, revealing herself to the General as an agent of the Brotherhood of Nod explicitly. Kane then shoots her while she is gloating, proclaims himself the future, and promotes the General to be the new Chairman and official leader of the Soviet Union.


The Allied ending is the canonical story though, and after RA1 they split them into separate timelines entirely.