Prime Minister David Cameron said he gave Russian president Vladimir Putin a "very clear and firm set of messages" during face-to-face talks in Paris about the Ukraine crisis and said the current situation is "not acceptable".
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The Cop26 talks were due to be held in Glasgow in November.
The World Health Organization said the number of deaths had doubled in the past week.
A supermarket boss has called on the Government to suspend Sunday trading legislation - which limits large grocery stores' opening times.