Al-Asad's phone will compromise the man that delivered the a-bomb. It's Imran Zakhaev, who used to be captain Price's enemy. The British shot off his arm when on a mission in Ukraine. You will have a chance to see it for yourself.
You will start this mission as Price not too far from the nuclear power plant in Chernobyl. You will be guided by captain MacMillian - listen to him very carefully as it will help you not to get in trouble . Remember that in this mission you should stay undercover.
Go straight ahead as MacMillian says (#131). Soon you will see two soldiers patrolling the area. Wait for the moment the two of them don't see each other. Then aim for the head of the one to the left (#132). MacMillian will take car of the other one.
Keep going. You will find a house with dogs inside. MacMillian will decide to pass this building. The yard is patrolled by one soldier (#133). Wait until he goes away from the house and kill him by shooting in his head. It's time to get going - stick close to MacMillian and no one will spot you .
When you get close to an orthodox church, MacMillian will tell you to stop. The guardian on the tower will spot you if you move any further (#134). According to MacMillian's suggestion, aim for his head and kill him, and then kill another enemy near a blue plane.
Wait for MacMillian to open the door and then keep going. A helicopter will show up so hide in the shadow (#135). If by any chance helicopter spots you, you can bring him down using Stinger launcher that is inside the church (#136).
Follow MacMillian. You will encounter enemies going towards you. As MacMillian says, get down and move aside so that they can't see you (#137). If any of them gets close to you, just lie still. Wait for them to move along and then start crawling ahead. When MacMillian says so, get up and start running - you will be safe for some time.
You will get to some kind of a junk yard. There are four opponents here. Two of them aren't dangerous temporarily - as they are throwing bodies into the water. The rest of them are patrolling the area (#138). Get rid of them just like you did it before - kill them when they don't see each other.
Then it's time to kill the rest of them. Wait for MacMillian to get into position. When he gives you the signal kill one of them by shooting in the head(#139). Captain will eliminate the other one.
You will get to some containers (#140). MacMillian will take over the control - he will give you some orders. Whatever he orders you, do it. He tells you to stay in the shadow, you do it. He tells you to run, you do it. By doing so, you will avoid the alarm and you won't have to fight.
After some time you will get to the place where enemy has gathered (#141). Wait until MacMillian gives you a signal and then do what he does - first run towards the vehicles (#142), and then crawl under them (#143). If you stick close to the captain you will remain unnoticed.
The next opponent will be standing at the top of the stairs by the building (#144) Use your sniper rifle to eliminate him.
Follow MacMillian. On your way you will encounter a wild dog (#145). It's better if you just stay away from it. If you shoot at him, other beasts will come.
After some time you will get to the building (#146) from which you will be able to shoot Zakhaev. However, you will learn some time later if the attempt was successful.