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Ukraine enforces no flight zone because of the war. Therefore there is no data.

Wait, does that mean there are no flights to Ukraine at all? Or is it mostly over the war zone in the east?

No flights at all. See it yourself https://www.flightradar24.com/

To answer the question of what has taken the place of air travel, domestic within as well as international mass transport to and from Ukraine has been predominantly train based during the most recent invasion:

https://apnews.com/article/russia-ukraine-war-riding-the-rai...

https://apnews.com/article/poland-railway-disruptions-arrest...

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