I completely missed how much The General was paid. Presumably the risk and value of TEN nuclear weapons was worth hundreds of millions of dollars. It appeared the Bosnian Serb terrorist group was comprised of three men. Was this just another example of hand-waving by the writers/director similar to how the one terrorist escaped the attack of the US helicopters and walked by foot how many miles with a nuclear device in his backpack?
Okay, I know it's been months since you posted this, but here is the answer.
Alexander Kodoroff was the Russian general who was in charge of stealing the nukes. But when Clooney asked the Indian guy who was hanging from the bridge where the other nuke went, the guy answered, "the man who set the whole thing up" took one warhead. Clooney asked "Kodoroff?" and the man said, "No, Kodoroff just handled the money. It was the other man." The man who took the last warhead in the backpack was in league with the terrorist at the end (if I remember right, it was his brother.) He said to Kodoroff, "Remember, we get one warhead to do with as we wish," to which Kodoroff responded, "after I get my money."
Soooo, clearly the guy who escapes with the nuke and his brother (the terrorist at the end) set up the whole deal, knew where to find the nukes, set up the buyer in Iran (who would pay the hundreds of millions of dollars you speak of) and, in return, they require one warhead. Predictably, then, the money was to come from the people who were acutally going to *buy* the other nine warheads. The one he kept in the backpack was sort of a "finder's fee." No plothole.
And when you're chasing a truck in helicoptors and there is gunfire being exchanged, you probably won't take much notice when one guy falls out of the back of a truck. Why would you? And why is it hard to believe that he'd walk miles with a nuclear device in his backpack. Sure, he problaby has back cancer now, but he doesn't care; he's planning on being in Manhattan when they blow it up as we see in the end.