That's questionable. The nationalists that overthrew the government (i.e. a proportion of the protestors) were setting up armed militia several days ago. It's unlikely the west weren't involved in some way in supporting (or even instigating) the protests. Both those situations mean there could very well have been pretty grave threats to many russian speakers, especially those in an area heavily pro Russia and anti nationalist groups that just got into power.
Much like Syria it's not as simple as many like to think. There is huge support on both sides in country and from nations themselves, followed by a large amount of "extremist" organisations mixed in. Basically they are both as bad as each other and we should only go in if we are honest with ourselves and admit it's only because it's in our interest that we want the pro westerners to get into power, rather than the usual gumph about helping the majority of citizens from "evil" governments.
