Now now, you're falling for the western media propeganda aht they want the sheeple to go with.Their passport numbers only had the last digit difference, xxxxxx1297 and xxxxxx1294, that would be one hell of a coincidence if they were legit ones
It's entirely normal for two people to be friends and just happen to have passport numbers that are only a digit or two apart...
Back in the real world. I suspect any Russian passports in that range are probably now flagged and being checked quite carefully by all sorts of security services as if they've been daft enough to use nearly consecutive numbers for two operatives it's quite likely they had a batch of them assigned be issued for agents.
But remember.
Despite the nerve agent being of a type the Russians produced, being used against someone who is seen as a traitor by the Russians, after the Russians have already used equally easy to trace poisons in the past, and after comments about killing traitors by the Russian leadership, having two Russians tracked on CCTV entering the country, being in the area where the poisoning took place, leaving immediately after, having traces of the poison in the hotel room, it's not at all likely it's the Russians, it's the Western governments or someone at Portland Down stole/made a sampl and used it.