I think its important to differentiate "many" from "majority". I've been to pro-Ukraine anti-Russia demonstrations and there were enough Russians there to convince me that the majority of Russians outside of Russia do not support the invasion. That being said, there are definitely plenty of idiots. In at least one case, I know someone who decided that despite not having lived there for 40 years, that now is the time to develop a sense of patriotism and return... it did not go well.