I don't see why that's necessarily true in this case. Yes, identities are fluid, but they're certainly not formless ether. Identities are self-reinforcing, particularly against one another and particularly in this situation. Every Ukrainian I've met is pretty serious and unyielding about the fact that they're Ukrainian and explicitly not Russian. Since Crimea, they've been willing to get in a fight about it.You do have to take into account how ephemeral identities can be, tho