I know we saw that Lavrov (Russia's foreign minister) said that Russia would stay out of the Ukraine revolution, but now we see contrasting information.
Russia has lots of support and many citizens living in East Ukraine, which was generally opposed to the revolution.
@teamwaffles speculated that the country may split and this is a step in that direction.
Russia last invaded Georgia after a similar revolution and now controls some of the states territory.
Hopefully we don't see that same thing play out here.