tell me about how to find sergei zovorotgo ? contact qoolquill@yahoo.co.in however the guards are unaffected
of bullets please tell me

The bullets not working is intentional, you'll find out why later.

There's a couple of guards to the rear of a building, if you get close enough unseen you can melee them and take their pistols.

Inaving a problem finding the building and the spot to take out the guy in the petersburg level.I go into the only building I can I got to a open window had the sniper rifle and still couldnt get a clear shot. Can some one help me what am I doing wrong.when I got to the window the lady says I need in the right spot quick? Im lost can someone help? and how can you get there without a ton of KGB's shooting you down?

Do you mean the level where you have to kill your clone?
If thats the case, sneak into the building 17 is in and fiber wire him. The best way to avoid the KGB, is to knock 17 out with the chloroform, then drag him to a good hiding spot. Fiber wire him there and when the cinema is over take his clothes and get out of there. They will attack you once they find the body, so the quicker the better.