Well, there are about 300,000 Poles in the west of Belarus, a nation ruled by "Jewish neo-communists" and also probably Moskals. Encouraging a breakaway or joining of Poland there would be pretty much an act of war. Commies suck, but those under them should work to bring them down in the region where they are ruled by them and not just breakaway and leave the problem to someone else. Anyway, in Transnisria "joining Ukraine" would not be so simple and not just an easy 1-2-3 "breaking away." The Ukrainians there, should work with the other groups who wish to see change in the region.
And what would be so bad about a Ukrainian minority in Romania? The Romanians hate the Soviet legacy as much as anyone and are logical allies for Ukraine and pretty much all Slavs if a greater Slavic coalition is ever to be formed.