>>/40670/
> Russia has a military base in armenia yo
Russia has friendly relations with both sides. Armenian relations had some cooling recently, but they are still friends.
Actually, Russia is in lose-lose situation. If it backs Armenia, Azerbaijan would be lost, and Russia has no good way to influence Azerbaijan in another way (economics aren't that highly tied, Azerbaijan also has own oil and ways to export it). If Russia backs Azerbaijan, it loses Armenia that can then go westward and became Georgia-like "NATO friend". But Armenia is less valuable ally, because it is basically an empty country without people and any reasonable economics (all Armenians are abroad, really). In both cases Russia loses one ally at south border.
In these types of situations regional superpower must say "just stop", without backing anyone, and both countries must stop. Otherwise superpower isn't really a superpower. But looks like "just stop" doesn't work, at least now. Maybe Moscow waits until new Armenian government became friendlier (i.e. until Armenia loses and cry for help).