Barack Obama cancelled his scheduled meeting with Vladimir Putin in Moscow, planned for early September, after Russia gave temporary asylum to US intelligence leaker Edward Showden. Relations between Moscow and Washington were further strained by differences over last week`s reported chemical weapons attack in Syria.
The Syrian issue will undoubtedly be raised by the G20 leaders during the summit, the White House official said.
"There`s, at this point, no formal session or event that would involve Syria, but we know that leaders will be talking about it," he said.
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