Russia demands nerve agent samples in standoff with UK over poisoned spy

Moscow summons British ambassador as foreign minister denies Russian responsibility for attack on Sergei and Yulia Skripal

Russia has summoned the UK’s ambassador to the foreign ministry in Moscow, as its foreign minister denied the country was behind last week’s nerve agent attack in Salisbury and said it would only cooperate in an investigation if it received samples of the agent.

“Russia is not responsible,” Sergei Lavrov said during a televised press conference that marked an escalation of the standoff with the UK over the poisoning of the former Russian agent Sergei Skripal and his daughter, Yulia.

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