After U.N. Report, What's Next For Diplomacy In Syria?

President Obama sounds optimistic about the latest attempt at diplomacy in Syria. CNN's Jim Acosta reports.

As the United Nations released a long-awaited report Monday confirming that sarin gas mounted on rockets was used to kill more than a thousand Syrians in August, the U.S. and Russia negotiate a plan for Syria to give up all its chemical weapons to the international community.

The President responded:

"We took an important step in that direction towards moving Syria's chemical weapons under international control so they can be destroyed. And we're not there yet, but if properly implemented, this agreement could end the threat these weapons pose, not only to the Syrian people but to the world."

The U.N.'s Chief Ban Ki-moon said whoever used the poison gas committed a war crime and must face justice.

"Those perpetrators who have used chemical weapons or any other weapons of mass destruction in the future will have to be brought to justice. This is a firm principle of the United Nations."

The diplomatic deal, meanwhile, could give the President a way to avoid U.S. airstrikes in Syria.

Syria's Bashar al-Assad has just a week to list what weapons he has, where they are, and how they're made.

Though to keep the pressure on, Obama says he's keeping the U.S. military at the ready if Assad doesn't comply.