The prime minister tells world leaders at G20 summit in Mexico that Greek crisis must be resolved quickly – and decisively

David Cameron warns on Monday that the eurozone risks facing perpetual economic stagnation from an unresolved crisis or a breakup caused by a failure to address its underlying economic failures.

Britain will feel the impact of any continuing crisis, the prime minister will say in a speech at the G20 summit of the world's leading economies which starts in Mexico today. The summit will last two days.

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