Could it be because Qatar is the largest exporter of liquid natural gas in the world and Assad won't let them build a natural gas pipeline through Syria? Of course. Qatar wants to install a puppet regime in Syria that will allow them to build a pipeline which will enable them to sell lots and lots of natural gas to Europe. Why is Saudi Arabia spending huge amounts of money to help the rebels and why has Saudi Prince Bandar bin Sultan been "jetting from covert command centers near the Syrian front lines to the Élysée Palace in Paris and the Kremlin in Moscow, seeking to undermine the Assad regime"? Well, it turns out that Saudi Arabia intends to install their own puppet government in Syria which will allow the Saudis to control the flow of energy through the region. On the other side, Russia very much prefers the Assad regime for a whole bunch of reasons. One of those reasons is that Assad is helping to block the flow of natural gas out of the Persian Gulf into Europe, thus ensuring higher profits for Gazprom. Now the United States is getting directly involved in the conflict. If the U.S. is successful in getting rid of the Assad regime, it will be good for either the Saudis or Qatar (and possibly for both), and it will be really bad for Russia. This is a strategic geopolitical conflict about natural resources, religion and money, and it really has nothing to do with chemical weapons at all.