If it’s a country that’s integral to the downfall of imperialism, unless you’ve managed to convince the military and other potential internal dangers to side with your organization (so that there’s no significant security gap right away), I don’t think it’s a good idea to attempt a revolution as long as the outcome would almost certainly be a foreign invasion. Of course, that doesn’t mean that you shouldn’t prepare for a revolution (you definitely shouldn’t be idling, as you said), but the foreign imperialists are far more of a threat than the internal bourgeoisie is, to the world’s proletariat

If you’re in the imperial core (excluding Amerika), while a revolution certainly would put your country in danger of an invasion or the like, a successful counter-revolution likely wouldn’t have a worse outcome (in terms of foreign policy, at least) than what you had before the attempt