You're just conveniently ignoring that this isn't really a Crimean call for self-determination--It's the voice of Russian nationalists speaking for Crimea.
and good sir, they are 70% of the population. why should that voice not be heard. They have been a autonomous republic for a while and they called for Russian help when they felt that their right as a republic was going to be jeopardized when the takeover happened in Kiev.
why do you have dissonance when a replublic of people ask another nation for help. dont they have their lives, families to protect