Are you asking me? I would find it hard to be consistent: Kosovo, Abkhazia, Palestine, Chechnya, Crimea, so many choices to make, so many fine differences, so much tangled history.
I do (retrospectively) support the US decision in 1861 to prevent the Confederate states from seceding, despite the expressed will of the white, property-owning part of the local population, so there's that.
Sounds like you pick and choose based on how much you like the ethnic group in question - which is exactly why Russia supports it for Crimea but not for Chechnya.
Ethnic conflicts aren't soccer matches where you should pick a team to support.
In this discussion, I've explicitly (and quite off topic) expressed support for the Union side in the US Civil War, and I've implicitly supported Ukraine's side in the Crimean dispute. I don't think that gives you enough data points to deduce whether I choose sides on the basis of ethnicity, or because of a liking for the letter U, or (most probable?) a curmudgeonly dislike of change.
I do (retrospectively) support the US decision in 1861 to prevent the Confederate states from seceding, despite the expressed will of the white, property-owning part of the local population, so there's that.