I just can't see why Putin would have him killed. It makes no sense to me, he was already in prison, why make him a martyr now, before elections? As an idea elections in Russia are this month.
We also know Tucker interviewed him shortly before Navalny died and we know that Navalny chose to be in Russia. Maybe CIA wanted to not allow people to process the interview and move to martyr Navalny. There are some spicy stuff in the interview like the US blowing Northstream pipeline and Nazis in Ukraine so who knows.
Every media and politician is 100% sure Putin killed him without even considering any alternative.
My take is that the CIA killed Navalny in order to start unrest before elections or to make sure normies keep funding Ukraine.
That's not what the Russians themselves believe. They seem to be (via Telegrath I follow about the Ukraine war) the belief that MI6 did the actual wet works. Yes, it was caused by the CIA directive, but they're on about the british being the actual boots on the ground.
Due to five eyes and the USA being the only service site for British nuclear weapons, it's a distinction without a difference.
What do they say the motive was?