Right! I think Fisk implied that getting rid of the Russians had always been something he'd do at some point, but Matt was the trigger to escalate their mutual conflicts. Without Matt, they'll probably stay around longer (unless something else happens to enrage Fisk enough to destroy them).

As far as I understood it, the Russians run a trafficking ring. They kidnap people and sell them. They also distribute the drugs Gao's men produce.

Vladimir doesn't submit to Fisk at all, gets on Fisk's (and Wesley's) nerve. I don't see that changing, but having him around opens possibilities to the plot. (Too soon to say, but maybe at some point Matt's group will have to strike some kind of deal with Vladimir.)