Russia and US had the first collaborative mission under President Trump.
Together they banded up officially to retake Raqqa (Syria). The reality is that they need to “set up shop” in Manjib as they need to stop Turkey to advance in Syria and fight the Kurds (allied both of US and Russian) and prevent a direct contact between Turkey supported and Kurdish forces and Syrian Army.
And showed it showed no objection to Russian and Syrian humanitarian aid.
This is the President Trump first strategic move in Syria.
Practically accepting that Syrian Army has won with the help of the Russian and that this is a much better solution of the “help the good terrorist (mhh good terrorist?)” tried and repeatedly failed by President Obama. Plus a stop to the Turkish “friendly” invasion of Syria.