I think this article is grossly mistitled. Obama is merely the head puppet for the capitalist deep state that rules the US and (along with the British capitalist ruling class) much of the US-led Empire. It should read something like this: "The US government is moving on legislation to authorize anti-aircraft weapons to 'moderate rebels'".
The legislation has already passed the House of Representatives after a closed door session and is expected to be considered in the Senate within a week. These weapons in the hands of terrorists poses a direct military threat to both Russian and Syrian warplanes.
The rapid liberation of the Syrian city of Aleppo, against the background of a complete collapse of the actions Washington led coalition in Mosul has clearly driven the Obama administration mad.