There are far-right extremists everywhere. The UK and France, to give two close examples. Doesn't mean Putin has the right to invade the UK, or France!It could and SHOULD have been avoided as much as Putin should not have done what he did perhaps Zalensky had not carried on making noises about joining NATO and ceding some territory it could have been avoided?
We conveniently forget that the Ukraine is home to the the openly Nazi paramilitary organization the Azov Battalion - this played right into Putin's hands and gave him the opportunity to justify his "special military operation".
That's just being used as an excuse and the real Nazi is, of course, Putin.