For the sake of reminding you as you are trying to ignore real life.Yes, CIA version is only a version based on allegations.
However GRU version as well is only a version based on allegations.
YOU DONT KNOW THE FACTS.
Ergo, you are only making wild guesses.
If you would like to know more facts, then YOU personally as a Russian would need to apply pressure to YOUR government to extradite or return the two suspects to the UK.