I’ll respond with an analogous example.
If a province of N Korea revolted and tried to join S Korea, how should libertarians react? Should we be uncompromising Rothbardian purists and say it’s just one state against another state (as the above questions suggests)? Should we criticize the revolutionaries as American/NATO/globalists puppets because S Korea is home to American military bases, and then praise Kim Jong Un for courageously resisting aggressive military expansion (as much of the libertarian press has done)?
Obviously, the revolutionaries in that situation would be fighting for more self-ownership, better property rights, and more universal rule of law. This is EXACTLY what Ukrainians were fighting for on maidan. They were joined by Jews, Georgians, Armenians, ethnic Russians and many others.