I’m surprised to see it that long into the war. I know it’s not a military target per se, and it’s probably became feasible recently due to new lenghts of reach, but it takes use of the most basic difference between two states - their size - and how accustomed russians are to take an hour flight where it could took dozens of hours on train instead. I suspect only americans can get the whole idea of infranational flights being a thing and so critical. For average europeans, flights are for faster international travel, while here they are treated as a default if not as an almost mandatory option to get to another city some thousands kilometers away.