Russian Prime Minister Dmitry Medvedev threatened on Tuesday to retaliate for the grounding of a subsidiary of national airline Aeroflot because of EU sanctions, with one newspaper reporting that European flights to Asia over Siberia could be banned.

Low-cost carrier Dobrolyot, operated by Aeroflot, suspended all flights last week after its airline leasing agreement was cancelled under European Union sanctions because it flies to Crimea, a region Russia annexed from Ukraine in March.

The business daily Vedomosti reported that Russia may restrict or ban European airlines from flying over Siberia on Asian routes, a move that would impose costs on European carriers by making flights take longer and require more fuel.