Supplying weapons to whom? It was bona fide weapons purchases program from one state to another, like all other states procure their weapons.
Syrian war was civil war financed by the NED, USAID and other US entities to topple Assad, like they did in other arab spring states.
It took several years of civil war and unsuccessful bombing of civilians by Barry Soetoro, unsuccessful funding of various jihadi groups by the Pentagon and CIA (separately), the same groups that led to the rise of ISIS. Only then by the request from then president Assad, did Russia help with strikes against ISIS
Syrian war was civil war financed by the NED, USAID and other US entities to topple Assad, like they did in other arab spring states.
It took several years of civil war and unsuccessful bombing of civilians by Barry Soetoro, unsuccessful funding of various jihadi groups by the Pentagon and CIA (separately), the same groups that led to the rise of ISIS. Only then by the request from then president Assad, did Russia help with strikes against ISIS