The Russian reply to this charge, of course, is that Ukrainian Nazis did it in order to make Russians look bad
Ah yes, those mthical Nazi's that have evaded detection, capture or even being photographed
To be fair, there is what started off as the
Azov battalion, a right-wing extremist, neo-Nazi, formerly paramilitary unit of the National Guard of Ukraine, and at least some of its units have been photographed.
It was formed in May 2014. On 12 November 2014, the battallion was incorporated into the National Guard of Ukraine. Since then all members have been official soldiers serving in the National Guard. As membership grew, the battallion became a regiment. In 2017 the size of the regiment was estimated at more than 2,500 members.
That said, Putin's claim of liberating Ukraine from Nazi oppression is a bizarre thing to say about a country whose head of state, elected by popular vote, is Jewish.