Russia's Foreign Minister Sergei Lavrov has reportedly told his French counterpart that any proposal for a UN resolution holding Syria responsible for a chemical weapons attack would be "unacceptable".
Separately, Russia's foreign ministry said it will propose a UN draft declaration supporting an initiative to bring Syria's chemical weapons stockpile under international control.
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Accompanied by the Duke of Edinburgh, the Queen will attend the opening ceremony of the fifth session in the Holyrood chamber.
Ms Leadsom has received the backing of Ian Duncan Smith, the former work and pensions secretary.
The former shadow work and pensions secretary is considered a more viable candidate than Angela Eagle, a Labour source has told ITV News.