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Nato leaders discuss Afghanistan withdrawal

20 May 2012 Last updated at 22:33 BST

Nato leaders are meeting in Chicago in a summit dominated by the withdrawal from Afghanistan.

They want to forge a common stance as they prepare to hand over security to Afghan forces by the end of 2014.

President Barack Obama warned of "hard days ahead", and Afghan President Hamid Karzai said his country was fully aware of the responsibilities.

Mark Mardell reports.