You will find yourself in Russia, where Nikolai, agent working for the British, is being held prisoner by ultranationalists. Your primary objective is to rescue Nikolai and evacuate in a helicopter.
Wait for Gaz and Price to finish their conversation, then follow them to the first hut(#15), occupied by the enemy soldiers. Kill them and head towards the next building (#16). Here - following your commandor's advice - you can plant some mines by the door, and then rouse the enemies outside by shooting. Or, you can just shoot them. No matter what option you will choose, follow your team afterwards. Captain will open the door (#17) and in no time you will meet sergeant Kamarov (#18).
The Russian will ask for help in rescuing the village. Follow Gaz, Price and Kamarov until you get on a cliff (#19) Draw your sniper rifle. You can kill the enemy soldiers running down the cliff, but your objective is to kill the soldiers who operate the machine guns to the left(#20). Kill them (to kill the other one, you will have to shoot through the wall) and wait for the loyalists to take over the control.
Follow your teammates into a ruined house(#21) and get on a glade near the power plant (#22). Here, you will have to deal with the soldiers that will come in helicopters. Use the howitzer to kill them - it'll eliminate enemies in groups.
When it's done, Kamarov will ask you for some sniper support from the cliff(#23). Start killing the opponents and reinforcements that are coming. Eventually, you will have to eliminate 3 soldiers occupying one of the buildings (#24). A whole in a roof will be helpful.
Go up the hill towards the power plant (#25). There will be some misunderstanding between Price and Kamarov. Then British soldiers will decide to attack the village. Grab the line (#26) and go down, then go to the left and start eliminating the enemies.
Most of them are hidden in the biggest building (#27) so you will have to get inside. When walking through the yard, mind the grenades and exploding cars - both can kill you.
After killing the soldiers in the house (#28), wait for your teammates to join you. Get rid of the rest of the enemies, and follow your team into the next building, on the hill (#29). When Gaz cuts off the power, you and Price will get inside (#30). Use your nightvision and eliminate all the enemies. In on of the rooms, there's Nikolai (#31) - he will be freed when all ultranationalists are dead.
After a little chat, go outside. Head towards the helicopter and get inside (#32), to finish the mission.