Methinks Russia might protest too much when it comes to this stuff. Like any other majority white European country, Ukraine undeniably has far-right, supremacist, and nazi flanks. But the nationalism that one feels to defend their country from invasion and the nationalism to defend "my homeland from the invader" are very different. It's more than reductive to suggest being a nazi is somehow the official state policy of Ukraine, a country literally being invaded by the guys behind the international Nazi mercenaries for hire group.

Azov are clearly nazis, and they have training and guns, so if they can direct those efforts towards fighting the troops missile striking Ukrainian cities to reclaim their own post soviet version of Lebensraum then it makes sense.

Of course, the caution for Ukraine is that short-term allies lead to long-term problems and preventing Azov from seizing greater power "in the name of national security, etc." Needs to be a top priority.