LOS CABOS, Mexico - Russian President Vladimir Putin made it clear during the G20 summit in Mexico that he does not want President Bashar Assad to remain in power in Syria, British Prime Minister David Cameron said on Tuesday.

Russia has been the staunchest backer of Assad and his military crackdown against militants and protesters in Syria, including supplying arms to the Syrian government.

But Cameron said Putin had shifted his view of the Syrian leader.

"There remain differences over sequencing and the shape of how the transition takes place but it is welcome that President Putin has been explicit that he does not want Assad remaining in charge in Syria," Cameron told reporters.

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