"We're evaluating some mutual ideas in a constructive way, period," Kerry told reporters at the United Nations, one day after international envoys failed to find a way to revive a US and Russian-brokered truce.
Kerry and Russia's Foreign Minister Sergei Lavrov have met several times this week in New York, including yesterday as joint chairs of the 23-nation International Syria Support Group (ISSG).
But they have failed to agree on a way to revive the deal that they had reached in Geneva on September 9, under which Moscow would ensure its ally Bashar al-Assad honors a ceasefire and Washington would rein in Syrian rebels.
"I met with the foreign minister, we exchanged some ideas and we had a little bit of progress," Kerry said.
Earlier, before the meeting, Lavrov had been asked whether there was any way to revive the ceasefire. He replied simply: "You should ask the Americans.
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