1) As soon as you can move run down the hill infront of you and shoot the two bad guys at the bottom. Run to the right of the structures and then turn right and run down the path a ways. When the path starts to turn to the right look for a path through the structures. It may take a while to find if you don't know where it is.
2) After you go through the short cut turn left and go under the fallin blocks. They look like dominoes that are laying on each other. After you go through this you will see a metal crate that you can walk inside. Go inside and talk to Valentin.
3) Once he is done talking run out of the crate and turn left. Head for the Lenin Statue. Once you get there hide behind it and turn off your weapon. Once you find out who Janus is and the screen says objective complete change to your KF-7 and shoot the guy farthest to your left and the guy next to him. Then run that way and zig zag. Now run back to the helicopter.
4) When you see the helicopter make sure your on the side with Natalya and then run in and wake her up.
5) After she is up. Run down the hill like you did in the beginning, don't wait for her to talk. Once your down the hill look for the flight recorder. It is sometimes hard to find but if you get luck you will find it quick. After you find it run up the hill.
6) Run to were Mishkin is holding Natalya. Turn off your weapon and instead of talking to Mishkin just walk out the gate.