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Highly doubt Moscow is in Norwegian's sights, if it didn't work for easy why will it work for them
Sanctions and resulting economical recession in Russia with harder VISA requirements in both directions have done for the EasyJet Moscow services for the time being.
From the UK side no one else in the flexible fares bracket is likely to try again any time soon.
For certain Norwegian wouldn't even get the traffic rights if they tried.(Needs to be a UK or Russian registered carrier)
Russia/UK bi-literals are very restrictive, hence the former Transeuro code share arrangement with EasyJet.
Those Bi-laterals are probably the reason S7 can't get traffic rights into the Oneairline hub either.
Sure they need a UK carrier to match and whom would give it a go ?