They would not be able to, they are a city of civiians going up against a brutal tyranical merderous well equiped and heavily armed regime. Remenber Tiamemen square in Beijing, the communists killed over 10,000 unarmed civilians, and rolled battle tanks over many of them.

If world allows this again, its an inditement on all governments, and all politicians. Only thing in the world than stop such crimes against humanity, is the US Military Forces. None other are capable, or morally inclined, like the usa or not, it is the only capable force for good that will act, and you may curse the USA out today, but tomorrow cry out for its help.