It's one thing to shoot down a russian jet that was allegedly flying into turkish airspace (despite the kremlin claiming otherwise). It's a whole other thing to declare a no-fly zone above ukraine and actively shooting down jets.

Why Turkey can defend its airspace and Ukraine can't do the same together with its international partners, in a manner similar to EU airspace protection for example?

The main practical concern here is just that russia can launch planes and missiles from inside russia. If you want them to stop you're going to have to bomb some airbases.

Or you're going to honor the border I guess? Are they free to bomb civilians as long as it launches from their side? Even the best planes will get shot down if you give the other side enough chances, is nato going to allow that? Anyway where even is the border at 50k feet? How many conflicts have started because a pilot accidentally entered another country's airspace? Or at least that the other country claimed they had.

No fly zone does not concern to Missiles, yes you honor border and you can't bomb anything without invading airspace.

>How many conflicts have started because a pilot accidentally entered another country's airspace? Or at least that the other country claimed they had.

Exactly 0.

You're not arguing against an impartial observer. You're arguing against putin. You seriously think that putin is going to be persuaded by this type of lawyering? I think even to a layperson it's fairly obvious that the two represents two very different actions, and very different levels of escalation when it comes to their relations.

Putin did nothing when Russian jet was shot down.

> without any consequences

Are you sure there were no consequences?

Yes I am sure.