It is obvious that Russia and China will not allow UN intervention in any way as they are fearful of similar acts against them in their own territories. However, the USA could act in ways that would help stop the violence. The US has for years complained that Syria has been supplying terrorist groups. We routinely send military drones over nations that have either refused us access, or who have complained about such action. This includes Pakistan, Somalia, Sudan and have intervened in nations without UN approval as in Granada. Obama could send drones over Syria or along the Syrian/Lebanese and Turkish/ Syrian and Iraqi/ Syrian border to protect the Free Syrian Army and unarmed refugees. Such drones could attack Syrian troops under the same authority we use drones against terrorists: to stop acts of terror. If we did this, even once, it would send a message to the Syrian army that they were are the road to Benghazi and an end to their assaults might result as well as a wider debate within Syria to stop the descent to civil war. It will continue the impression created by NATO intervention in Libya that no tyrant can massacre its own people without reaction from abroad.