Mentioning Putin in the context of Sergei Skripal's poisoning "is nothing but shocking and unforgiveable behaviour from the point of view of diplomacy," Peskov said.
Speaking of Putin, Johnson on Friday said: "We think it overwhelmingly likely that it was his decision to direct the use of a nerve agent on the streets of the UK, on the streets of Europe, for the first time since the Second World War."
Skripal and his daughter Yulia are in critical condition after being exposed to a Soviet-designed nerve agent on March 4 in the English city of Salisbury.
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