Russia may restrict flights of Western carriers over its territory if new financial and energy sanctions are imposed, Russian Prime Minister Dmitry Medvedev told Vedomosti newspaper.

Discussions began on changing trans-Siberian routes for European airlines in early August when Aeroflot subsidiary Dobrolet had to cease operations after just two months because of the sanctions.

European carriers have said airlines could see increases in flight times, fuel consumption and cabin crew wages—which would give a competitive advantage to airlines from other regions, such as Asian carriers—if the airspace suspensions happen. Finnair said it could be negatively affected because its strategic business flights to 15 destinations in Asia are primarily over Russian territory.

However, Russian industry experts say the ban would also have a negative effect on Russian carriers.