Volodymyr Zelensky has the world on his shoulders

Everyone except the Russians and possibly the Chinese wants President Zelensky to be the victor in this terrible war between Russia and Ukraine. Could Ukraine defeat the Russian army? It can't be ruled out because so far the supposedly superpower Russian military have proved themselves to be not up to scratch. Nato could beat them out of their skins. Ukraine is doing a pretty good job of it, and it looks increasingly unlikely that Russia will succeed in capturing Kyiv. The capital is a fortress and the Russians just don't have the logistical back-up to settle in for a long siege. So unless Putin orders the invasion force to destroy Kyiv like they have destroyed Mariupol, then Kyiv will survive and so will Zelensky. Literally the whole world is listening to Zelensky's every word and as every day goes by his oratory gets more refined, more Churchillian, more eloquent and more pointed. Why, he keeps on asking, are he and his country being left to take on the might of the Russian Bear? Thanks for the weapons and pre-invasion Nato training, he acknowledges, but the fight, the real fight, is all down to the Ukrainians. When the invasion was launched I suspect most of the top officials in the Biden administration imagined, like Putin did himself, that it would all be over pretty quickly and that Zelensky would either be captured or killed. Today, a month later, Zelensky in his combat-style clothes is the standard bearer for democracy and freedom. How long can he carry on? Is it possible Ukraine could drive Russia to an ignominious defeat? The trouble is, I'm not sure which scenario is the more dangerous for the whole world, a victorious Putin or a defeated Putin.