Navalny needs to get out of Russia. Putin has nailed the doors shut.

The Berlin-based Cinema for Peace Foundation organised an air ambulance to pick up Mr Navalny and bring him back to Berlin, where it said the Charite hospital was ready to treat him.

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At a news conference in Berlin, Mr Navalny’s aide Leonid Volkov said at first doctors at the hospital had been helping to facilitate his transfer but abruptly stopped doing so.

“[It was] like something was switched off – like medicine mode off, cover-up operation mode on – and the doctors refused to co-operate any more, refused to give any information even to Alexei’s wife,” he said.

“The doctors who were helping to do the paperwork to make the transportation of Alexei to Charite possible started to say that he’s not any more transportable, he’s not any more stable, contradicting themselves.”

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Yulia Navalnaya said she thought the Russian authorities were stalling so that evidence of any chemical substance would be lost.

Chemical substance? What chemical substance?