A man, affected by what activists say is nerve gas, breathes through an oxygen mask in the Damascus suburb of Jesreen on August 21.
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Can Russian plan for Syria chemical weapons work?

11 September 2013 Last updated at 12:02 BST

Russia has put forward a proposal which it hopes will prevent US-led military action against Syria - it has asked the Syrian government to put its chemical weapons stockpiles under international control and then have them destroyed.

Newsnight's science editor Susan Watts considers if the plan could work.