Before I started Jiu-Jitsu a few years ago, almost all of my training was from an old Russian guy. He said there were a few different Combat styles the Soviet Military trained it's soldiers depending on your Region and Unit. He was from Saturn Unit, Northern Fleet (Black Uniform, Polar Bear Insignia). He said there were influences from Japan (because of the shared Island chain with Russia), from East & Southern Asia, as well as from European Regions. Most of what he taught was a stand-up style because the type of Combat they were involved in did not allow for much time on the ground. Lots of weapons and improvised weapons training, lots of striking, lots of situational training (in/out of vehicle, seated/standing, confined space, hand cuffed, prisoner). I think EVERY aspect is important, my old coach said that if he was a younger he would be studying the modern ground game as well, "I was once young and handsome, now only handsome remains" is what he says.