Who else is likely to be deploying a nerve agent against a Russian former spy, exactly?
It seems too obvious for Russian intelligence to use their own nerve agent though. And everyone knows Russians can be bought - including those in control of these substances.
Well if it's specifically intended to be a just-deniable-enough message to other defectors (or to a domestic audience who are receptive to the message), then it's supposed to be obvious. Obvious but hard to prove definitively.
Interesting how quickly the conversation has swung to letting Russia off the hook because Boris is a blithering idiot.
Who else is likely to be deploying a nerve agent against a Russian former spy, exactly?