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Securing Syria's chemical weapons could take years

Even if Russia's proposal of locking down Syria's chemical weapons receives international assent, experts believe it could still take years to realise.

Destroying chemical weapons is a hugely hazardous task that cannot be rushed, and according to US intelligence there are some 1,000 tonnes worth across some 41 sites in Syria.

ITV News' Diplomatic Correspondent John Ray reports on the challenges involved: