Foreign Secretary William Hague admitted that "the world has failed" in its responsibilities to Syria and that it "continues to do so".
Pressed by ITV News' International Editor Bill Neely to admit that the G8 talks had made "no progress" on the issue, he said he had never expected a breakthrough at the meeting.
But he added that the discussions, which included Syria's ally Russia, had been valuable and that it was "vital to continue the discussions if we are ever to make a breakthrough".
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A 25-year-old man has been arrested in Newport, South Wales, in connection with the Parsons Green terror attack, Scotland Yard said.
A milder night ahead with some cloud low enough to be misty in places.
Tata Steel and Thyssen Krupp will formally announce the merger of their European steel operations on Wednesday, ITV News understands.