Washington has called on the Syrian armed opposition to stick to the milestone US-Russia deal, calling on militants to part ways with Al-Nusra or face repercussions, a letter written by the US special envoy to Syria said. It reportedly promised rebels a right to retaliate.Addressing unspecified “armed Syrian opposition factions,” Michael Ratney wrote that the US is awaiting a “confirmation”from rebels that they are “ready to commit” to the Friday agreement. It hails the breakthrough deal struck by US and Russia on Friday as the “best way” to decrease the number of casualties. The letter, which is in Arabic, was seen by AFP and Reuters. So basically what this states is that one US supplied rebels have been fighting with ISIS and Al Nusra all along in Syria, and two that these ISIS fighters or "rebels" are allowed to fight Russian and Syrian forces during the ceasefire. Stating that it looks like this ceasefire is going to be broken within the week, because I'm sure Russia didn't agree to Obama supported terrorist fighting back as a part of the deal. What I see here and every American should see here is that it's official that the Obama administration is supporting terrorist groups in the middle east, after telling "Syrian Rebels" to break away from the ISIS affiliated group of Al Nusra. So America how do you like the Obama administration admitting to supporting terror groups and supplying them with our tax dollars? This proves Obama is the enemy since day one, and not Russia, Syria or Putin.