I have difficulty buying the neo-Nazi line. I doubt that what is going on in Ukraine is anywhere near as ideologically pure as some are trying to make it seem. Furthermore, I don’t trust the motives of those who engage in this demagoguery
The peg, or McGuffin, for that line is the fact that thousands of Ukrainian ex-Red Army POW's rallied to the Germans behind Gen. Vlassov when Hitler invaded Russia. Ukraine had suffered mortally (millions of dead) just a few years before, at the hands of Stalin and the NKVD.
Numbers of these Ukrainians of Vlassov's army were in the trenches in Normandy when the Allies came ashore. Their uniforms were German regulation, except that they wore black garrison caps that identified them as Ukrainians.
After the war, they were sent back to the Russians (this was Alger Hiss's work, I read somewhere, and one of the most shameful episodes of the Second World War), who promptly executed every last one of them.
Any Nazi-Ukrainian connection from that time has been dead a very long time. Stepan Bandera's late-40s insurrection was connected instead to the CIA (which was compromised by the homosexual KGB superspy at the top of MI-6's Soviet Desk, the notorious H.A.R. "Kim" Philby), and Bandera was assassinated in Germany in, um, about 1954 by a KGB goon armed with an electric gun that shot poison crystals. But not before the Russians had to fight a brigade-sized pitched battle with tanks against the independence-minded Ukrainians.