So they blamed Russia for a staged murder, creating a very serious and very public international incident, as part of an investigation? How is no one raising the possibility that this was done to frame Russia, and that now they have changed their mind for whatever reason (perhaps fear of the ruse being discovered). Surely that’s worth considering.
It’s exactly what we would be speculating if it was done by a regime considered hostile to the West, instead of one considered friendly.
I have no reason to believe any particular theory of what actually happened and why, but surely, the Ukrainian government’s explanation should not just be parroted uncritically by the press and commentators.