US and Germany urge Russia not to arm Syria military

QuestCinq.com/News/05/31/13
How the Russian S-300PMU-1 missile defence system works
- The long-range surveillance radar tracks objects over a range of 300km (185 miles) and relays information to the command vehicle, which assesses potential targets.
- A target is identified and the command vehicle orders the engagement radar to launch missiles.
- Launch data is sent to the best placed of the battalion’s six launch vehicles and it releases two surface-to-air missiles.
- The engagement radar helps guide the missiles towards the target. It can guide up to 12 missiles simultaneously, engaging up to six targets at once.
Source:BBC