Based on historical statistics, there's an approximately 5 in 8,000,000,000 chance of this actually happening, and if you've never talked to a Russian in your life, the statistic drops to 2 in 8 billion (those poor souls who were injured accidentally)
30 million dead Ukrainians disagree with your statistic.
That is an inflated statistics of people in the USSR killed by the tyrant of their own country. If anything it supports the point made above.
I am acutely aware of the Holodomor. However those who died in the Holodomor were not killed by nerve agents, they were killed by forced starvation.
that would be the UK government, has nothing to do with the FSB (which is btw ~ FBI of Russia) or NSA.