So what? Russians in Poland are also afraid of president Putin. And Russian embassy is considered a territory of Russia. Besides, no one in Poland said that they were skinheads. This info appears in Russian press.
Eye witnesses told Radio Free Europe/Radio Liberty they were skinheads.
You can be in denial about that all you like, but I tend to beleive a respected publication like Radio Free Europe/Radio Liberty.
The Polish government obviously has an interest in keeping the details of this out of the press. Radio Free Europe/Radio Liberty is a non-Polish publication and as such reported the facts.