Russia threatens to suspend talks with US on Syria ceasefire

Latest: Russia's foreign minister has said he is thinking of "calling it a day" on talks with the United States to forge a ceasefire in Syria.

Update 9pm: Russia's foreign minister has said he is thinking of "calling it a day" on talks with the United States to forge a ceasefire in Syria.

He said it may be necessary to have follow-up talks next week.