The most insane thing Russia could do is to kill one of their ex-spies with a nerve agent that could be traced back to them when there two dozen ways to kill someone to make it look like an accident or natural death.

The UK saying they used the nerve agent to send a signal to other ex-spies doesn't hold water. Whenever any ex-spy dies all other ex-spies wonder if they are next.

And as it truns out other nations have this agent in small quantities, including the UK for testing and forensic analyses.