Russia has threatened to cap flights over Siberia by airlines from the European Union, including British Airways and Virgin Atlantic.
Russia's deputy transport minister Valery Okulov said he was looking at limiting EU airlines' use of the routes over Siberia and giving preference instead to carriers from Japan, China and other Asian nations.
This could limit the number of new flights from the UK and elsewhere in Europe to Asia and Australia because, if Russia carries out its threat, it would force airlines to take a longer and more costly route.
The step by Russia is part of measures approved by 23 countries in retaliation for the EU's decision to start charging airlines for their carbon emissions on flights to and from Europe from January 1.

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