Now that Russia and the U.S. have made some headway in negotiations to stop the use of chemical weapons and to begin to secure them against further use, the pressure must be put on all parties to negotiate a ceasefire in the Syrian civil war. New Iranian President of Iran Hassan Rouhani has offered to mediate the two sides of the conflict in Syria. If the Obama administration, along with its allies, can agree to enforce the terms of the U.S.-Russia agreement on chemical weapons, the administration can also get the Russians to help us enforce a ceasefire. After two and a half years of war, with two million Syrian refugees, uncounted injured Syrians and a decimated state, there are no more excuses for stalling on a settlement. The U.S., Russia, France, Turkey, Saudi Arabia and Qatar — and the rest of the nations that have cynically supported either side in hopes of gaining an upper-hand by exploiting Syria's version of the Arab Spring — must now come to terms with the newest low of this terrible conflict. Death by chemical weapons is abhorrent. But so is the death of any innocent, at any time. Without a negotiated settlement, Syrians can only look forward to more of this terrible same.