Facts only: Kosovo vs Crimea - 'Good Independence' vs 'Bad Referendum'

Facts only: Kosovo vs Crimea - 'Good Independence' vs 'Bad Referendum'
The West has so far refused to legitimize Crimea’s decision to secede from Ukraine. Yet Kosovo, which was a part of Serbia, also broke away from its parent country, but has been recognized by the US and most of the EU.

But what makes one breakaway more justifiable than another, in the eyes of the world community?