Yes, one may be thinking of it as "not losing something". But it's much easier to not lose something when it's in your possession than when you depend on goodwill of some third party.

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.