I would be sceptical that it was done "by" Putin if I believed that he was in control?
Novichok is rare ("[there is not] a single case of such poison being sold illegally" according to the director of the Russian plant that manufactured it [https://en.wikipedia.org/wiki/Novichok_agent#cite_note-FP453...]), and has only been observed in the wild in the hands of organizations like the GRU (at least in the west). Poisoning Navalny certainly should've required top level approval from someone, if not Putin then it's highly embarrassing - whose head is rolling?
Novichok is rare ("[there is not] a single case of such poison being sold illegally" according to the director of the Russian plant that manufactured it [https://en.wikipedia.org/wiki/Novichok_agent#cite_note-FP453...]), and has only been observed in the wild in the hands of organizations like the GRU (at least in the west). Poisoning Navalny certainly should've required top level approval from someone, if not Putin then it's highly embarrassing - whose head is rolling?