As you've probably suspected, you will have to rescue the second VIP. He is lying on the floor, inside the destroyed embassy. Start running towards it (#1). The VIP can be found in a designated spot (#2). You will have to protect him against enemy attacks. I would recommend that you order your team to take positions inside the embassy. It's crucial that your teammates aren't standing outside. Otherwise they would have died almost instantly. You should also find a suitable cover.
The first group of enemy soldiers will appear on your left (#1). It might surprise you a little bit. The terrorists came through a hole in the wall. They will try to kill a protected VIP. You will have to defend him at all costs. The second group will appear here later during this mission. Now you will have to focus your attention on the roundabout area. New enemy soldiers will appear there in a few seconds. Some of them will arrive inside vehicles. You will have to kill the gunners (#2), mostly because they pose a quite serious threat.
A first enemy tank (yes! there's going to be more of them ;-)) will arrive here very shortly (#1). You will have to deal with this problem swiftly. Choose the Apache option from the main menu (instead of a usual teammate). You must use the crosshair to lock on the target. Order the gunship to destroy the tank (#2). Before that happens, make sure that none of your squad members gets hit. All of your teammates must be hiding inside the embassy!