It's a shame people don't understand that there's never compensation or netting between wrongdoings. It always spirals into chaos.
Thanks all for links and info, it's a good thread overall.
My take on this is simplifying, and this is always a dangerous thing to do but this is how I rationalize the events.
1. Small countries are always under the gravitational pulls of the large powers. This gravity means political and economic influence, interference, manipulation, etc. I'm not debating on why is this happening, it's as natural as gravity.
2. Ukraine as a state, was and is under strong Russian influence. Their leaders have obviously always been "validated" by Russia. Russia paid, and still pays for its presence (and for their Crimean bases) with gas, but did not care too much what crap those leaders were doing in their own country because corruption is something natural in Russia too.
3. Ukraine has a diverse ethnic structure but lacks the wisdom of a mature country, corruption is endemic and ethnic intolerance is at high levels all over the country. Blaming Russia for all that is a cheap shot.
4. Maidan came as a reaction of the western side of the country, build on the frustration that they cannot escape the Russian sphere of influence. Of course there was western (US) interference and support in all this, there always is, see point one.
5. Russia took Maidan events as an aggression of the US on it's sphere of influence(EU is a military dwarf, it does not count), and being kind of a last stand for them (see the strategic positioning of Crimeea) reacted aggressively to it. Imagine Russia trying such a move in Central America, how would US react..). I think this was their plan B in case there are signs of losing Ukraine, brake it and create a smaller buffer. It is a rather recurring strategy of theirs: Kaliningrad, Transtistria, etc.
But again, these are defensive moves. I believe the Russian leaders have this growing frustration that they feed half of the world with raw materials and energy, are at the same time a huge consumer market for Western products, but politically and militarily, Russia is shrinking at at fast pace. This is a lose-lose situation, that they are very aware of. So they are unlikely to let go.
6. Ukraine's East is ethnically Russian. Ukraine has to respect and deal with that correctly. The slogans of the Maidan were not that much for freedom and reconciliation, they often targeted directly the Russian citizens of Ukraine. A country that is in control of its territory by using its army against its citizens does not deserve that territory, and foreign intervention is necessary from wherever, and whatever the hidden agenda. National sovereignty should never justify international inaction in the face of atrocities.
7. I see no bright future for Ukraine in it's present shape and government format. Having its borders rather artificially set within the USSR, it is very heterogeneous. The only way to save itself is federalization. Otherwise it will brake. Russia needs the eastern buffer, one way or another.
8. Also, the Russians from East Ukraine deserve a normal life, just as normal as the westerners.