Re-reading Vlad's bio, and it points out that he studied several martial arts, was wondering about those other influences on what he 'does' now, and also on what he 'teaches' now?
Karate and boxing were two of Vlad's previous arts AFAIK. I would say that neither contributes to what he currently teaches.
Personally, I studied Chinese internal systems for many years before finding Systema. Very little of it remains in what I do now. both in teaching and in practice.