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My take is there are currently massive machinations and manoeuvres in the Russian Federation right now to take power which is why there are so many assassinations / accidents. Much is probably resulting from Putins paranoa, but there also seems to be people openly criticizing and positioning such as the Wagner PMC boss Prigozhin and also the Chechnyan Kadyrov, who are lining themselves up to replace Putin.
This also seems to be the reason for the reluctance of the US to give Ukraine all the long range weapons such as ATACMS, which would quickly turn the war, as they are terrified of Russia collapsing, and being taken over by 20 regional warlords all with ballistic nuclear weapons.
Who was it that described Russia as tyranny moderated by assassination?
Another window incident too - one of his travelling party also died a couple of days prior, although no mercenary glazing fixtures were thought to be involved