All claims to the sovereign integrity of Ukraine were placed on the table the day after the democratically elected government in Kiev was overthrown by a small group of radicals.
In the absence of the democratic process established by the Ukrainian Constitution, residents of Eastern Ukraine have as much right to self determination as the residents of Western Ukraine.
If that self determination turns out to be greater autonomy from Kiev or even disassociation, it is not a decision outside powers get to make.
In the absence of the democratic process established by the Ukrainian Constitution, residents of Eastern Ukraine have as much right to self determination as the residents of Western Ukraine.
How exactly is an invasion of Ukraine by the Russian Army self determination?
There is plenty of evidence the coordinated military assaults in Ukraine last weekend were done by regular Russian Army units.
Even without that proof it's totally implausible a bunch of Ukrainian villagers got a hold of high quality military gear and launched those assaults on strategic targets along a strategic route. All at the same time.