Russian expert James Nixey told ITV News that he does not think the meeting between Russian President Putin and Prime Minister Cameron will "result in a substantial change in position."
He says there is still a "fundamental divergence of values" on the issue, and he does not think "one pre-judo meeting" will accomplish.
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Showers continue across some southern and western areas tonight.
Two people are being treated in hospital after an "explosion" in a flat in West Dunbartonshire.
Tom Billings, 22, went missing in Canada in December 2013 during an eight-week trip of North America.