There are various clans of power in Russia, and not all of them are loyal, or report, to Putin.
Navalny had a lot of enemies.
> complacent
It's likely. The alternative could lead to some serious instability. For example, evidence suggests Kadyrov took out Nemtsov, but holding Kadyrov accountable could lead to chaos in Chechnya. Is it worth it? This is realpolitik.
> one of his henchmen
There are various clans of power in Russia, and not all of them are loyal, or report, to Putin.
Navalny had a lot of enemies.
> complacent
It's likely. The alternative could lead to some serious instability. For example, evidence suggests Kadyrov took out Nemtsov, but holding Kadyrov accountable could lead to chaos in Chechnya. Is it worth it? This is realpolitik.