British Prime Minister David Cameron tried to convince Russian President Vladimir Putin to take a tougher stance on Syria on Thursday before the two headed to a judo competition at the London Olympics. But after 45 minutes of talks in Downing Street, Cameron and Putin agreed to disagree, saying Russia and Britain still differed over Syria. After the meeting, the pair left for the ExCel Centre in east London where military officers and uniformed police lined either side of the VIP entrances to the judo arena. Photographers turned their backs to the competition to capture the moment. An honorary president of the International Judo Federation, Putin is a huge fan of the sport. He has been a judo competitor since his childhood, eventually gaining the rank of black belt.