Alternate WWII: Britain, France, & Nazi Germany vs. Trotskyist Soviet Union

[ShadowRocket]

How would this play out?

I'm imagining a scenario where Trotsky succeeds Lenin instead of Stalin, builds up the Soviet military, and launches an invasion into Europe in the mid or late 30's to export the revolution.

Hitler still comes to power in Germany as much the same as IRL.

[Agonized-Statism]

Red Alert isn't realistic. The Soviet Union wouldn't "launch an invasion of Europe" like comic book supervillains- one, that's a misunderstanding of revolutionary export, two, everyone in the USSR understood that such a scenario would leave them standing alone against an anti-communist crusade by the countries controlling the world and all its resources. The Soviets' outlook changed a lot after the Revolutions of 1917-1923 fizzled out, and you can't extrapolate the optimistic hawkishness of Trotsky forward from that time. Trotsky would send troops to support a sizable revolution(s) that had already been started by a given people at most, but more likely he would either accede to or be forced to accede to some or all of Stalin's pragmatic Socialism in One Country theory. Also, there would more likely be a generic fascist Germany than a specifically Nazi one since a Trotsky powerful enough to be considered Soviet leader would have also been influential enough to encourage a front between the KPD and the social democrats, stopping Hitler at least in his tracks. That said, a "Notzi" Germany without so much of Hitler's belligerence might have been a more formidable force. You know who would win in such a lopsided scenario.