Oh it was here https://www.nato.int/cps/en/natohq/opinions_218172.htm#:~:text=The background was that President,condition for not invade Ukraine

this bit in particular

The opposite happened. He wanted us to sign that promise, never to enlarge NATO. He wanted us to remove our military infrastructure in all Allies that have joined NATO since 1997, meaning half of NATO, all the Central and Eastern Europe, we should remove NATO from that part of our Alliance, introducing some kind of B, or second class membership. We rejected that.

So he went to war to prevent NATO, more NATO, close to his borders. He has got the exact opposite. He has got more NATO presence in eastern part of the Alliance and he has also seen that Finland has already joined the Alliance and Sweden will soon be a full member.