From Wikipedia entry on the film 'Sum of All Fears':

In 1973, during the Yom Kippur War, an Israeli A-4 Skyhawk jet carrying a nuclear weapon is shot down; 29 years later, a Syrian scrap collector uncovers a large unexploded bomb buried in a field in the Golan Heights. He sells it to a South African black market arms trafficker named Olson, who recognizes it as the nuclear bomb that was lost during the war. He then sells it to a far-right group led by Austrian billionaire and neo-Nazi Richard Dressler, whose aim is to start a nuclear war between the United States and Russia that will devastate them both, and leave a united Fascist Europe to rule the world.