No it can't. Ukraine doesn't and can't have nukes. Russia has thousands of nukes. This doesn't even begin to make sense. Nobody can invade a nuclear power, let alone one with as many nukes as Russia.
> From Moscow's perspective Ukraine could have a Nazi party take over at some point in the future.
This is their propaganda. It's that logical fallacy; anything could happen, therefore this. Far-right gets very little support in Ukrainian elections, and neo-nazism is a bigger problem in Russia, Poland and Hungary than in Ukraine. Maybe Russia should be scared of Hungary; fair enough. But Ukraine? Azov is a large problem that needs to be dealt with, but it has nothing to do with neo-Nazis inside Ukrainian politics or leadership or broader society. If they wanted Ukraine to deal with Azov, they would stop threatening Ukraine, and then Ukraine wouldn't have the need for Azov. If you create an intense need for defence, then of course Azov isn't going to be dealt with. Azov is purely the fault of Russia.