In my opinion, the problem is not saying that Putin is winning. Objectively, I also think Putin is winning right now. Because Putin is bombarding Ukraine, has already destroyed a big part of Ukraine, but nobody has destroyed a big part or Russia. There are millions of Ukrainian refuges, there are zero Russian refuges. We were afraid that Russia will take Kiev and they didn't, but that does not mean that "Ukraine won", it only means that "Ukraine survived". We don't know what will happen in the future, Ukraine may win, but even then, they may have hundreds of thousands of dead citizens, and hundreds of thousands of destroyed buildings. We know for sure that at the end of this war a large part of Ukraine will be completely destroyed.
What I don't like is the blatant Russia propaganda that says "Europe has to make a deal with Putin the winner and cut ties with USA that has its own selfish reasons to be involved". It's a constant theme of Russian propaganda. The wet dream of Russia is that NATO will break up.
So, we see that some people here continue this theme. Putin is bad, but Putin is a winner and Europeans should make a deal with Putin. Forget USA, they are selfish, Europe has to break ranks and make a deal with Putin, giving him what he needs to be happy. Forget what Ukraine wants, Ukraine is not worth supporting if that means that the European economy suffers. It is better if Europe makes a deal with Putin right now, and makes money helping Putin be strong and happy. Sure, some Ukrainians died but it is better to finish the war now, give part of Ukraine to Russia, and prevent more deaths. After all, Ukraine used to be a part of Russia, why is Europe keeping this war going? Europe is partly responsible for the deaths, because they give arms that are being used in this war.
I think that this line of reasoning is not "opinion". It is Russian propaganda. There is a difference.