The British and American soldiers came into the Russian mountains (#189). Your team is lacking Briggs as he landed in completely different spot and got caught by the ultranationalists. Follow you compass, and kill the soldiers patrolling the area (#190). After short while you and your team will get to the first buildings.
Price will open the door (#191), and you'll get inside. Kill every opponent (the ones upstairs too - #192) and wait for your teammates to say that the building is cleared. Get downstairs and walk outside.
Kill the patrolling soldiers (#193) and get into the building from which Grigg's signal is coming. Your teammates will blow the door and kill the enemies. You will have to help Griggs. Release him (#194) and go outside.
Head towards the pylon (#195), and watch out for the helicopters patrolling the area. Plan the explosives on the pylon, and move away from it. Use the detonator. The enemy's camp has no power now so the fence can be cut (#196). Keep going.
You will get to a hole in the wall, walk through it (#197) and pick up the sniper rifle (#198). You will use it to eliminate the enemies coming towards you. Get on the position (#199) and start shooting.
Opponents will be coming out of the bug building that is right in front of you, and some of them will come in a helicopter. Listen to your teammates as they will inform you about soldiers equipped with RPGs. They'll show up on the roof to the left (#200) - you have to eliminate them.
When this part of the camp is dealt with, keep going. Soon you will meet another group of ultranationalists (#201). Eliminate every opponent and watch out for the red barrels that can kill you. After that you will have to face the reinforcements, that will get there in trucks. The best spot to deal with them is the first floor of a nearby building (#202). This place will be great to eliminate the opponents and because it's higher, you will be able to see more (#203).
When you finally kill all of them, keep following the path (#204). After a while you will meet the american squad of snipers. Then nuclear missiles will get launched and you will witness it.