This is a logical reaction to what is happening. It is advisable not to go where it is unsafe. And don't poison your citizens. However, those wishing to get to the place where the planes fall can do it from the territory of other countries, having previously got out there. Well, the theory of filling Crimea in this way (in winter and in the dark, yeah) is some kind of very paranoid conspiracy theories.
Some other. Filling the Crimea with tourists. If there were no airbuses and bombers, they would be worth inventing. Well, I generally think they were invented.