LONDON (Reuters) - Black-belted Vladimir Putin locked horns on Thursday with British leader David Cameron over Syria before heading for an afternoon of judo diplomacy at the Olympics where he may face questions over a crackdown on Kremlin opponents. Prime Minister Cameron tried to push the former KGB spy to take a tougher line on Syria, Russia's firmest foothold in the Middle East, and stop blocking Western-backed resolutions aimed at stepping up pressure on President Bashar al-Assad. ...
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