Last month, Putin called Navalny’s demise “sad” and said he had been ready to hand the jailed politician over to the West in a prisoner exchange provided Navalny never return to Russia. Navalny’s allies said such talks had been under way […] Washington had not absolved the Russian leader of overall responsibility for Navalny’s death however, given the opposition politician had been targeted by Russian authorities for years, jailed on charges the West said were politically motivated, and had been poisoned in 2020 with a nerve agent[, for which Russia also denies responsibility].
Reuters could not independently verify the Journal report, which cited sources as saying the finding had been “broadly accepted within the intelligence community and shared by several agencies, including the Central Intelligence Agency, the Office of the Director of National Intelligence, and the State Department’s intelligence unit.”
You could argue that Putin killed Navalny the moment he sent him to the prison camp.
And you would technically be correct.