1. Can Ukraine alone defeat Russia? Of course not. 2. Can Ukraine with limited non-nuclear support from NATO/West defeat Russia? Of course not because Russia can supply and deliver more resources more quickly than NATO/West ever could. 3. Can Ukraine with unlimited non-nuclear support from NATO/West defeat Russia? Of course not because Russia can supply and deliver more resources more quickly than NATO/West could for the foreseeable future until they match Russia's ability to build, supply and deliver the necessary resources to Ukraine, which is debatable. Even if they could, Russia can simply switch to tactical nukes. 4. Can Ukraine with limited nuclear support (ie, tactical nukes) from NATO/West defeat Russia? Of course not because Russia can use more of its tactical nukes faster than NATO/West can do. 5. Can Ukraine with unlimited nuclear support (ie, any type of nuke) from NATO/West defeat Russia? Of course not because Russia would simply use their nukes which happen to be as powerful and as numerous as those of NATO/West, if not more. In that case, though, neither side wins.
So, if the only scenario that leads to a Russian defeat also leads to a worldwide nuclear war, what's the point of it all? The obvious conclusion is that leaders all over the world, and in particular in the West are insane and hell-bent on leading us to a nuclear world war. It has to stop before it's too late, and it can only stop by having BOTH sides engaging in serious and deliberate peace negotiations. Just as in the case of war, it takes two to tango in any long-lasting peace.