all this land is my country’s, the other country should not exist.
One of those countries is an ethno-religious state that is exclusive of the other. Can you guess which one?
If you are an ethno-religious exclusivist who says “your country shouldn’t exist only mine!” and I am a country that multi-religious, and say “actually my country should be the prevailing one, not your exclusivist one”, you gotta realize those two are massively different, unlike you portray.
The Russo-Ukranian conflict is clear. One leader is claiming the land of the other
Russia’s original pretext for the war is not about territorial gains. It was supposedly regarding Ukraine’s attack on Donetsk, Luhansk, and ethnic Russian populations in general (such as the Odessa massacre), what they also called “de-nazification” of the Ukrainian government, and Ukraine’s bid to join NATO. This is easily verifiable, but I can provide you a sources on this if you doubt me.
I am not claiming what Russia is saying is true, but it is not what you make it seem to make your argument.