Direct flights between Ukraine and Russia have been grounded as new sanctions initiated by Kyiv came into effect.
Flights stopped on October 25, after last-minute crisis negotiations between the two sides failed.
Kyiv announced late last month that it would ban flights by Russian airlines in reprisal for Moscow's March 2014 annexation of Crimea.
Russia called the ban "madness" and said it would mirror the move.
Tens of thousands of passengers will be affected by the bans every month.
They will now be forced to take longer, more expensive routes via third countries, or to brace themselves for a 13-hour trip by train.