Ukraine is holding on now because management in Russia is terrible and not practical, Russians have much less motivation to fight in a neighboring country than Ukrainians' desire to defend themselves, get to Europe, return Crimea, etc. - this is one of the reasons why the mobilization in Ukraine did not fail yet.
However, the propaganda of war in Russia is great and the longer the conflict lasts, the more victims there will be. Russia will destroy Ukraine - this is a fact, but Russia will lose in the fight to the NATO bloc - this is a fact.
Ukrainians cannot win a long war only with financial, technical, and moral support. The Pentagon knows that. Ukrainians can lose alone or win by truly uniting with those who have supported this conflict and strengthened it for decades. But this will lead to a nuclear war.
If Russia stops advancing and starts defending its real borders, it will lead to the defeat of the entire Ukrainian army. It will be meat. What is the risk of the West and Europe today? Nothing. As long as American soldiers do not attack Moscow, Ukrainians are alone, this is a fact. A full-scale intervention in the war by the Western side will lead to the slaughter of all.
The Pentagon does not need Ukraine, it is just a tool. Russia lost to the Pentagon by invading Ukraine. While Ukrainians are holding on by themselves, no one will come to their aid. Putin is betting that mobilization in Europe and in the USA will fail.
Ordinary citizens of Russia and Ukraine have already lost - this is a tragedy that is likely to lead to the death of 70% of the world's population. Sooner or later, the conflict will go beyond the borders of the two states.
This is one of the global plans, not the most popular, but more realistic than it seems.
Personally, I am against wars and the use of climate/biological weapons against people. Saving capitalism by exterminating people is nonsense for me. Unfortunately, I can't influence that...
Thank you for your opinion!