Russia demands evidence ahead of UK poisoning response deadline

Moscow is demanding a sample of the substance Britain says was used in a poisoning attack on its soil. 

The UK says it is encouraged by the international support it has received since naming Russia as the likely culprit.

Moscow has until the end of Tuesday to respond to Britain's demand for an explanation.

Paul Barber reports from London.

IN: Moscow says it 

OUT: SOC

DUR: 34 seconds

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