I think that closing of air space over the conflict zones is an international matter, since all understood the risks equally by all I mean governments, regulatory organisations and carriers.
Now I understand that the steps have been taken to change the system, such that the regulatory organisations will be dealing with no fly zones and not the carriers who have to assess their own risk over profits.
Another thing is that Ukrainian officials and UN are aware of the military hardware which was left in Crimea including the aircraft with Ukrainian IFF systems and that’s another portion to think about.