President Trump approved the sales of lethal weapon to Ukraine.
This was an highly contentious issues as the previous sales were always non-lethal military technology.
This will provoke Russia to answer. It could be a flare up in Ukraine or somewhere else (Russia always plays asymmetric warfare – so something could happen in Syria).
Also in Syria there has been a coordinated 13 drones attack with advanced capability (radius of more than 50kms). While nobody can blame anybody, IS never showed such a capacity (max radius 2kms) and there was a US Poseidon intelligence aircraft in the area.
The Russians already hinted to a potential US involvement as excluding IS, there is only the US backed Syria free alliance.
Unfortunately it fits with my newsletter article on the next Syrian war.