Doctorow is a careful analyst never overstating a situation. In this interview he says that the FSB statement implicating the US and UK governments in the Crocus attack had to have been approved by Putin and that implicating the US and UK in the Crocus attack has brought us to the level of danger of the Cuban Missile Crisis.

Doctorow reports that Russian television has undergone a massive change following the Crocus attack. Commentators are unwilling to accept any longer Putin's nonresponse to attacks on Russians. Television talk is suddenly very violent with talk of flattening Kharkiv and Kiev and bringing a quick end to the conflict that has been permitted to endure for far too long.

It seems that a fatal red line has been crossed.

https://www.youtube.com/watch?v=2RMFLQVym7M