Former secretary of state Henry Kissinger said Sunday that he expects Syria to comply with 90 percent of the tentative deal requiring it to turn over chemical weapons to international monitors.

"Based on no inside knowledge, my guess would be that they will comply with 90 percent of what they are supposed to do, and that they may hold back a little" Kissinger told CBS's "Face the Nation," according to an advance transcript. "But the risk of holding anything back is very great."

Kissinger also suggested that Russia can be trusted to broker the deal because it is in its interest for Syria, its ally, to turn over its chemical weapons.

"You can trust the Russians to pursue their own interests," Kissinger said.

Kissinger said he remains optimistic that the deal would have a positive impact on the region and the world.

"There could be quite a good outcome, ‘cause if we get the chemical weapons, it then becomes a basis for a transition in Syria that leads to relative peace then at the end of the day," he said. "However tortuously we arrived at this conclusion, it will have served the interest of the world."