He is suggesting that a no-fly zone should have been instituted prior to the invasion, at the invitation of Ukraine. This would have produced significantly different military and diplomatic implications; it would have required Russia to be the aggressor, and attempt to strike NATO aircraft preemptively before mounting their initial attacks in Ukraine.
If implemented now, a no-fly zone would require NATO aircraft to behave offensively, and would require strikes on Russian air defenses on the ground as well as aircraft.
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It's not too late to put up a no-fly zone. If it was ok then, why is it not ok now?
He is suggesting that a no-fly zone should have been instituted prior to the invasion, at the invitation of Ukraine. This would have produced significantly different military and diplomatic implications; it would have required Russia to be the aggressor, and attempt to strike NATO aircraft preemptively before mounting their initial attacks in Ukraine.
If implemented now, a no-fly zone would require NATO aircraft to behave offensively, and would require strikes on Russian air defenses on the ground as well as aircraft.
Before anyone lynches you and takes this off-topic:
toward NATO*
Yes, thank you, that was my intended meaning.