Annexation? No. Overthrowing governments with subterfuge or force? Absolutely
The only target for annexation would be Quebec (there's a small minority party there that has talked about this for a long time) but that's extremely unlikely. Anything else would be colonization which isn't fashionable.
Russian annexation is targeting places with large ethnically Russian people who speak Russian and identify more with Moscow than their local government.
If you believe the line, there is a significant population in these places that want to be annexed.
Anyone who is saying that is probably exaggerating the support but it's hard to deny that support exists.
I believe in self determination more than border immutability. Free and fair elections would be preferable, of course. I don't know what the Crimeans want but it's plausible that they prefer their current situation.
It would be nice to hear actual Crimean voices instead of Moscow or Washington. Anything the latter two say seems only in self interest.