> they check both passports on the outbound travel to Russia, e.g. in Narva, Estonia
Who is "they"?
If "they" is the airline, then physically show them the Russian passport: they don't record this information, they only need to see it to confirm that they won't have to fly you back (for free?) to your departing location.
If border control (again: by flying), simply saying "my flight is to the UK" works.
Who is "they"?
If "they" is the airline, then physically show them the Russian passport: they don't record this information, they only need to see it to confirm that they won't have to fly you back (for free?) to your departing location.
If border control (again: by flying), simply saying "my flight is to the UK" works.