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".
More top news
"Important clarity" or the grounds for the "theft of democracy"? The PM's declared aims for negotiations have received a mixed response.
A divided theme across the UK today
400 people will run for mental health charity Heads Together, which was set up by William, Harry and Kate.