On Mariupol... it seems that Putin could enter the city. The obvious problem is that there is no longer a city in there, he has conquered a flat plain full of rubble, dead and hungry people. He has simply flattened it and that only leaves ill will and hate. I guess that is not an immediate problem for Putin, yet controlling a territory that is hostile is a costly effort, so this "victory" may become his new Afghanistan, but hey, feel free to consider it a victory if it happens.
The occupation of Ukraine is not the purpose of the special operation. Ukraine will lose its army and ultra-right nationalists, just as it has already lost Crimea, Donbass and Lugansk. And then she will begin to build a new peaceful life, while maintaining neutrality and loyalty to Russia. Because the blood ties between our peoples are stronger than the current ideological differences.
The only way there will be peace in this world is when all pro-Soviet imperialist enthusiasts are killed, in Russia and abroad (Belarus, Crimea, Donbas, Chechnya, Ossetia, Transnistria, etc).