History will likely be a cruel judge of the Obama administration's risk-aversion on Syria. Nobody will understand how the administration could not have done more in the face of the largest single refugee flow since the end of the World War II, the hundreds of thousands killed and the destruction of an entire society. The image of a failure to counter Russia and Iran will likely stick the outgoing administration like a barnacle to the side of a boat.

History will be a cruel judge of Obama's risk aversion in Syria (CNN)