What is the main conflict in Rainbow Six by Tom Clancy?

John Brightling, the wealthy CEO of an American pharmaceutical company, Horizon Corporation, has secretly hired a former Soviet KGB agent, Dmitriy Popov, as a consultant. Popov's role is to instigate a new wave of terror incidents across Europe. Popov will accomplish this by offering large payouts to contacts from the old terror network with whom he dealt in the past. Brightling does not provide Popov with the underlying reason for this operation.