“Trump is quite specific about letting Assad and Russia kick all the Islamists out of Syria”
That’s what is happening right now. Which is the status quo.
Not status quo! It appears that, even though he is still just a candidate and not the President, his foreign policy is being implemented on the world sage! Consider.
Trump formally announced his candidacy for the presidency in the 2016 election on June 16, 2015.
https://en.wikipedia.org/wiki/Donald_Trump
The Russian military intervention in the Syrian Civil War began on 30 September 2015, following a formal request by the Syrian government for military help against rebel and jihadist groups.
https://en.wikipedia.org/wiki/Russian_military_intervention_in_the_Syrian_Civil_War