After 22 months of civil war, in which an estimated 60,000 people have died, Syrian President Bashar Assad gave a defiant speech Sunday that ruled out negotiations with rebel fighters and made clear that he intends to remain in power as long as possible. Assad's words came as no great surprise. Seasoned diplomats, including former United Nations Secretary-General Kofi Annan, have tried and failed to broker a peace. So why does the war drag on? One key reason is that neither side believes it is losing.