It is a puppet government placed after the CIA backed coup of the democratically elected president. Banning all 11 opposition parties is literally what fascists do.

The Ukrainian units literally have swasticas and say Nazi rethoric and volunteers from other countries constantly complain of the virulent racism they experience.

Nazis are an existential threat to the Russian state as they have demonstrated by allying with NATO and causing a coup to the former elected president. That is why Russia has to denazi Ukraine.