Probably because of this:

Dmitry Valerievich Utkin … was a Russian army officer. He served as a special forces officer in the GRU, where he held the rank of lieutenant colonel. He is alleged to have founded the Wagner Group

According to several news outlets, Utkin is an admirer of Nazi Germany and has multiple Nazi tattoos, including Schutzstaffel (SS) insignia.

The tattoos are visible in multiple public photos.