The current Russian government supports every movement that may help to destabilize Europe, extreme left or extreme right ideologies only matter to them as a tool for targeting specific demographics by their propaganda industry.

https://en.wikipedia.org/wiki/Dmitry_Utkin and the whole https://en.wikipedia.org/wiki/Wagner_Group. Also https://en.wikipedia.org/wiki/Rusich_Group

I'm Russian, and yes, absolutely, Russia would do that so long as said party is friendly towards Russia.

It's not like it would even be the first time. USSR was very friendly to Nazi Germany in 1939-40.

And in modern Russian parlance, the words "Nazi" and "fascist" don't have any semantic load other than "our enemies". For example, EU is "Nazi", while https://en.wikipedia.org/wiki/Rusich_Group is not.

"extreme right" is a super set of "nazi". Putin is extreme right and not a nazi. Netanjahu is considered right extreme, certainly he is not a nazi. the list goes on.

Are you kidding? The Russian ruling class *adores* the global far-right. They don't see them as Nazis, but as kin.