When the EU essentially banned Dobrolet from flying to its countries, Aeroflot's stock took a huge hit, and decided to ground Dobrolyot. As somewhat of a revenge tactic, Russia now wants to prevent any EU carrier from flying over its airspace.
The fallout would be huge. According to the Moscow Times, "a ban could cost carriers including Lufthansa, British Airways and Air France 1 billion euros ($1.3 billion) over three months. Restrictions would lead to longer flights, higher fuel use and other additional costs." Currently, many EU carriers fly over Siberia in route to Asia, each paying Russia a fee that adds up to about $300 million a year of extra income for Aeroflot.
Thinking logically, if Russia decides to pull the trigger on such a ban, flight times wouldn't be the only thing to increase for passengers traveling from Europe to Asia. Ticket prices would surely go up as well to compensate for the increased cost. We'll continue to keep an eye on this story as it develops. It seems the next decision is whether Russia feels strongly enough about its loss of Dobrolyot to forgo the $300 a year it pulls from collecting "fly-through" fees.