How many neo-Nazi groups are fighting in the Ukraine-Russian war?

How many neo-Nazi groups are fighting against the Russian invasion? What would be their total number/strength in the resistance force?

According to Wikipedia, Ukraine has four neo-Nazi groups: (1) Azov Battalion, (2) Patriots of Ukraine, (3) Social-National Party of Ukraine,
(4) Social-National Assembly.

I know Azov Batallion is fighting against Russia. What about the other ones?

How many neo-Nazi groups are fighting in favor of Russia? What would be their total number/strength in the invasion force?