How do you (or anyone) personally benefit from "having Crimea"?
On the other hand, the usefulness of cordial relations with EU/USA is debatable.
You could make a point that if Russia had good relations with Ukraine, Russians could travel there on their own by just crossing that border. However, Ukraine shown by their repeated maidan coups and anti-Russian rhetoric that they can't be relied upon.
With thousands of civilians slaughtered and maimed, just to make a point.
Ukraine's reduction is someone else's problem. For some reason, Russian Federation did act like it was a nursery home for ex-Soviet independent states, but there's no obligation to put their interests past our own.
Putin's attitude towards his own people, basically.
Actual Russian Federation experience with all post-Soviet states ranges from bad to mediocre. It's as far cry as possible to e.g. the EU affair where one might say "I'm completely OK with %region% being a part of other country since I am always free to move there if I want, the local population is protected by laws and conventions as good as they are in my country, and even discussing political borders creates unnecessary strife". Perhaps it was the original idea behind CIS but it became very bad very fast.
But that's probably something where we differ. I view this Russian attitude as "we can't live as well as we'd like to so we'll at least make other suffer too". This is completely self-inflicted.
The Russian attitude is that if a third party makes some offer to any post-Soviet country, they should match it with an offer to Russia itself that is same or better, and are eventually ready to go to war over that.