Russia stepped in to broker a diplomatic solution.I don't want to quote too much from this excellent article. The above is only a small part of what is an insightful take on America's foreign policy. It's worth your time to read it all. It's a giant step up from the dishonest "Assad must go" fairy tale that we hear from Obama.
The campaign for regime change in Syria, as in Libya has been presented in terms of human rights. Obviously this isn't the real motive.
In 2009, Qatar put forth a proposal to run a natural gas pipeline through Syria and Turkey to Europe. Assad however rejected this, and in 2011 he forged a pact with Iraq and Iran to run a pipeline eastward cutting Qatar and Saudi Arabia out of the loop completely. Not surprisingly Qatar, Saudi Arabia and Turkey have been the most aggressive regional players in the push to topple the Syrian government.
But why would this pipeline dispute put Syria in Washington's cross hairs?
If humanitarianism were a consideration for Western leaders then no one would have stood by while over a half million Tutsis were murdered in Rwanda. Or while civilians die in, and refugees flow out of, Syria because of U.S., French, British, German, Saudi, Qatari, Turkish, and Israeli support for ISIS and various other scum fighting a war against the sovereign state of Syria.
 "The Geopolitics of World War III." By SCG, 9/11/14.