I cannot believe that you could be so confused about symbolism. It's called tagging to mark dead Ukrainians with swastikas to let their cohorts know that another neo-nazi fascist is dead. That's like a serial killer who murders prostitutes would tag them with the word whore.
It does not mean the killer was a neo-nazi, just the opposite.
The guy who was doing it is a f’n neo nazi you moron.