The Brits did it

International Relations analyst Gilbert Doctorow believes that Navalny was ultimately poisoned to death by...the British.

The Brits are more deeply involved in the war in Ukraine than most people realize.  Recently, for example, Ukraine was in the midst of exchanging hostages with Russia, but someone shot down the plane of Russians soldiers for Russia.  Russia honored the deal anyway, returning Ukrainian soldiers.  Why did Russia do that???  Because the Ukrainians convinced the Russians that the shooting down of the plane was not caused by them...but by the Brits.

And then there was Boris Johnson, who scuttled the first peace deal in 2022.

How could the Brits have done it?  They have Russian speaking spies in Russia who could easily have bribed someone in the prison.