“Offered no evidence” is factually untrue
What’s the more plausible explanation - that a practically non-existent irrelevant-for-years terrorist group running unsophisticated operations in Syria suddenly assembled an A-Team to kill 150 people in Moscow, or that the Ukrainian citizen(s) who tried to flee to Ukraine committed the attack at the behest of Ukraine, which is currently at war with Russia? A real mystery!
what was the evidence offered?
-At least one of the Tajiks is a naturalized Ukrainian citizen, and was granted citizenship essentially on the basis of being a freedom fighter
-Paid mercenaries who try to flee the scene is the polar opposite of the typical ISIS attack profile
-The terrorists were caught while breaking every highway regulation in the book making a break for the Ukrainian border
-ISIS plainly does not have the ability to carry out such an operation without a powerful backer. They have been reduced to attacking peasants and cops in the Syrian countryside. It would be less of an absurdity to point the finger at the Cosa Nostra.
-It is a bit of a misnomer to claim Ukrainian responsibility, as the Ukrainian state has auctioned off whatever they had left of their sovereignty post-2014 to the highest bidder. Indeed the Ukrainian government is by itself responsible for exceedingly little these days.
-Even if “ISIS” is responsible, seeing as they were/are propped up by US, Saudi, and Israeli interests it would not meaningfully change the perpetrator of ultimate responsibility.