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Syria crisis: President Putin warns US over action

4 September 2013 Last updated at 08:04 BST

Russian President Vladimir Putin has warned America and its allies against taking one-sided action in Syria.

He said any military strikes without UN approval would be "an aggression".

US President Barack Obama has called for punitive action in response to an alleged chemical weapons attack.

But Mr Putin said footage which had emerged online did not prove who carried out the attack.