Some of the posts here showed a total misunderstanding of what the rules of the air are and what the old Chicago convention stipulates. You can issue sanctions against airlines, not against State flights. Civil ATC is not a police service, any flight entering your airspace with a flight plan will be given service, what happens afterwards is a matter for the authorities after landing. There are more worrying things happening right now than worrying if one Aeroflot aircraft is entering an FIR supposedly not being allowed into .We should be far more worried about the Western aircraft currently taking shortcuts around Ukrainian airspace when hell will break loose.