“I think the most likely explanation is that two Russian agents”
There is no guarantee that they were Russian just that they came from Russia and returned according to the reports if they’re true.
If it is true are both sides checking airport CCTV? Passport/air ticket logs, credit card details to purchase the tickets?
although if they’re professional assassins then no doubt they would have used false documents but let me throw something out there, if I was a professional assassin looking to frame let’s say Nigeria then I would fly to several destinations around the world before flying to the uk, doing the hit and then flying back to Nigeria as I know that the secret service/ government agencies would check this fact,
Back to the airport CCTV? Where is it as they’ve already released CCTV of the suspects in Salisbury. Also have they questioned all those on the flights with these people coming here and returning?