This isn't my opinion since I don't consider myself well-read enough to have one, but I've read some people say it's possible the USSR would have been invaded/destabilized sooner if they were more aggressive in exporting revolution, which IIRC is one of Trotsky's main deviations from Stalin (who still exported revolution to some degree, but was more careful about maintaining friendly relations with capitalist countries to allow trade and time for the USSR to industrialize). Happy to be corrected or learn some nuance if someone more educated wants to chime in.