The two leaders chatted in a foursome with Obama's national security adviser Susan Rice and a Russian aide. Their meeting was visible on a television feed provided by the summit's host country of Turkey, but their conversation couldn't be heard. Reporters weren't allowed in for the meeting, which took place during a working lunch for leaders attending the summit.
Obama and Putin both leaned in close to each other as they talked, with Obama gesturing expressively with his hands.
The huddle comes as the U.S., Russia and other countries pursue a new diplomatic plan to try to end Syria's civil war.
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