This is interesting, not only was that Chechen convoy ambushed but the picture/video of them in a forest camp might well have led to them being hit with MLRS/Grad, at least 300 of them that is:
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Whether the FSB leak rumours are true or not, that convoy ambush + this apparent attack on their camp is no doubt a huge blow + the suspicion from an already paranoid Chechen leader of FSB assistance in some of this happening could perhaps cause tension.
Added to that he's always got internal threats from among other Chechens, presumably, this has weakened him a fair bit if he's lost most of the men he sent there (probably couldn't afford that sort of loss at all). There are of course rival Chechens fighting on the Ukrainian side.
Further to this, the whole Chechen situation has been nuts for a while, the infighting there isn't just between people who were on the Russian side during the second Chechen war vs rebels but also between people on the Russian side themselves.
Obviously, the current President has his private army, essentially local troops/police; the Kadyrovtsy (though officially under the Russian interior ministry) some of which have been sent to Ukraine, it was his father who made a deal with Putin and was the first Chechen Presiden after it was reabsorbed into Russia.
But there were other Chechen warlords too whose groups were part of the Russian federation too - there was the former bodyguard of the current President's father who lead a unit that was officially part of the FSB (Russia's security service/MI5&Special Brance equivalent and the main successor to the KGB), he was assassinated in Moscow in the 00s by Kadyrovtsy guys. There were also two other pro-Russian Chechen commanders both of which commanded units that officially came under GRU (Russia's (large) military intelligence unit) - there were actually firefights between these units and the Kadyrovtsy - essentially all of them officially coming under the control of the Russian government but fighting each other!!!
One of those commanders agreed to disband his unit, the other however was assassinated in Dubai, again in the 00s and again by Kadyrovtsy men... These guys are officially paramilitaries that are part of the Russian Interior ministry/officially technically part of Russian law enforcement/military yet they carry out assassinations not just in Chechnya (which a blind eye is turned to) but also in wider Russia and overseas.) this has meant one commander (who is also a current member of the Russian Parliament) is wanted along with a few other members of this unit in Dubai for murder!
Basically, Chechnya is a lawless **** hole run by ISIS-like guys who have worse than Russian levels of corruption + the usual middle east/central Asian religious **** hole levels of violence and infighting... and yet they're officially in charge of troops that are part of the federal government.
Now the head nutter has lost a bunch of guys in Ukraine... god knows what sort of infighting could happen in the future.