https://www.theguardian.com/world/2017/feb/15/anti-assad-states-meet-syria-concerns-american-policy-tillerson
The US is assisting the Syrian militias they've been helping but have shifted their focus to ISIS instead of Assad. They aren't reinforcing the Russian-backed forces.
http://www.reuters.com/article/us-mideast-crisis-syria-raqqa-idUSKBN16G1CB
This brings up the point raised by the writer on the Ron Paul site. What is the next step once the anti-Assad forces the US is supporting take a larger portion of the country?