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The German Chancellor and French Prime Minister will meet with Italian leader Matteo Renzi on Ventotene, a small island off the coast of Naples.

They are believed to be worried that Brexit could lead to the break-up of the doomed bloc, starting with an in/out referendum in the Netherlands.

Mr Renzi is eager for even more European integration, but Mrs Merkel has called for "a better Europe" rather than "more Europe".