I just got a plot idea, why don't Dimitri try a terrorist tactic, drive the car with high explosive directly towards the house, then he could detonate and kill everyone?
It works for Palestinians, Iraqis, and Afghans, so why not poor little Dimitri. It would be a lot easier and smarter to do that than to go in with everyone knowing who you are with guns blazing; even if you have an AK-47 and grenades. At the end, you will die either way, so why die in the most efficient military manner and take out as many as you can. The kGB was supposed to train their agents to think like that.