Is this conventional military warfare, or more gangland style warfare? Is this like during post apocalyptic world with no government around, or is the EU, Italy, and Russia all still viable states?
If this is gangland style, then it does not matter if Russian mob has ex military, or ex KGB. That is training for a different type of warfare. Plus Italian mob has plenty of guys that are former military, or even police officers.
Plus italians are more spread out in the world. They are in Brazil, Argentina, Murica, and Canada. Back in their heyday they will have political protection from those countries.