Crazy stupid
https://www.telegraph.co.uk/news/201...ergei-skripal/
"According to Fontanka, Fedotov flew to the UK on a passport whose number differs by only a few digits from those used by the two GRU military intelligence agents officially wanted for the nerve agent attack.
Fedotov’s travel itinerary, according to Fontanka, shows him arriving in London on a separate flight on March 2 - the day the two other agents arrived - but leaving on the same flight on March 4, the day of the nerve agent attack."