Let's examine what happened from the beginning. An extreme right wing group, with US and NATO support (according to released internal transcripts), overthrew the legitimate Ukrainian government (illegally) via violent coup. The fact that this group had western support is not important really, but should be noted. So according to 'international law' - this 'country' is NOT Ukraine. Ukraine cease to exist when this happened. The new 'government' - not popularly elected, seized control by force.