[it_does_follow]

Putin/The Russians aren't insane, they're looking after oil/NG interests. That's the entire reason they captured Crimea in the first place. The Ukrainian government then stopped the flow of water to Crimea to make it basically unusable.

NATO backed oil/NG companies also are annoyed because, despite investing a lot in gas fields in the East and the West, they haven't been able to produce much of anything because the region is under constant military conflict, funded by both the US and Russia.

I agree with the parent comment. If Russia can finally and absolutely control gas fields in the East and have assured access to not only Crimea but water to run the region they'll be getting much more out of this situation than they had prior. They will be interested in stability as much as NATO backed energy companies. Given the conflict in the region, and the recent (2014) overthrow of a government friendly to them (coincidentally right after Shell and Chevron signed contracts to develop gas fields), Russia is, rightfully, as wary of promises from the West as we are of them.

For purely, selfish, greedy reasons Russia would want peace in the region as much as NATO backed oil/gas companies have been hoping for it. There are still gas fields in the West that are waiting to be exploited and already have their resources under contract. Once these resources can be split up in a way everyone can deal with, there won't be conflict until the gas dries up because both parties make tremendously more money with stability after that.

[kavalg]

I wouldn't underestimate the value of the Ukrainian NPPs and fertile land too, as well as access to the Black Sea. Maybe even the human capital shall not be underestimated.