Given the question: Build a movie plot around this: How is the helicopter shot down? Russian SAM battery.
The answer is:
The movie begins in an Eastern Orthodox church in Pale, Bosnia and Herzegovina, when an unidentified man (later revealed to be a Bosnian diplomat to the UN) is murdered in an alley after receiving a page to meet someone outside.The scene then immediately shifts to a missile base in Chelyabinsk, Russia, where SS-18 ICBM's are being decommissioned. Ten nuclear warheads are loaded onto a train and sent to a separate site for dismantling. However, a high-ranking Russian general, Aleksander Kodoroff, has other plans. Along with a rogue tactical unit, he kills all the soldiers onboard the train and then transfers nine of the warheads to another train. He also sets the timer on the one remaining warhead, then switches tracks to send his train out of harm's way and the transport train on a collision course with a passenger train. Inside a mountain tunnel, Kodoroff kills one of his high-ranking lieutenants who'd had reservations about the mission. A few minutes later the trains collide. The thermonuclear warhead goes off moments later, yielding a blast about 500 kilotons in intensity. The explosion immediately garners the attention of the US government.Even though the detonation was staged to look like an accident, White House nuclear expert Dr. Julia Kelly (Kidman) is not convinced: SS-18 warheads can only be detonated deliberately. She believes that terrorists are behind the incident. Her newly assigned military liaison disagrees with her. He is smooth-talking and irreverent US Army Special Forces officer Lieutenant Colonel Thomas Devoe (Clooney), and he is convinced that the crash and the detonation were both staged, to hide the hijacking of the other warheads on board. A call to Devoe's long time friend and Russian counterpart, Dmitri Vertekoff (Armin Mueller-Stahl), adds credence to his hypothesis.Kelly and Devoe try to track down the terrorists through an Austrian trucking company which is a front for the Russian Mafia. Devoe and Kelly go to the company's offices and, when Kelly is unable to get answers, Devoe...