In four and a half years, Syria's civil war has killed 250,000 people and displaced 12 million -- half the nation's entire population. Supporters of both sides agree there cannot be a military solution, but the fighting continues, now to include about 50 American Special Forces. The US and Russia joined 15 other nations last week -- including archrivals Iran and Saudi Arabia — to discuss a diplomatic solution. The al-Assad regime was not represented. The closed-door meeting produced nine points of agreement as well as plans to meet again soon, but international rivalries already threaten to derail any progress.