You are either missing, or intentionally avoiding his point.
Just saying.
No, I'm saying there is no point to discussing his opinions if we can't agree upon a couple of fundamental objective facts.
He said I won't admit it is just my opinion that there was no treaty of NATO promising to never accept former Soviet states. That isn't an opinion. It is an object fact.
The reason that is important, is that several of these discussions as you drill down on "opinions" on Ukraine, many are distorted by the believe that we had broken a signed treaty never to expand NATO into former Soviet states. That's how they justify Putin's actions. Putin is supposed to be the aggrieved party.
So before we discuss any opinions on Ukraine it is a good idea to establish the facts that no such treaty has ever existed. It is Russian mis-information. And if someone won't just stipulate an obvious objective fact, opinions are uninformed and just noise. And certainly no opinion should be based on Russian mis-information.