Firstly, this is not a war between Ukraine and Russia, but between Russia and Ukraine, since it was Russia that attacked Ukraine, and not vice versa.
Secondly, during the 11 years of military actions between these states, no regular military units of NATO member states have been deployed on the territory of Ukraine. If NATO troops had fought on the side of Ukraine, this war would have ended with Russia's defeat long ago. Ukraine receives various types of assistance in defending its sovereignty and territorial integrity from many states, including NATO members, but this assistance, especially weapons and military equipment, is very weak and does not allow Ukraine to achieve a relatively quick victory over the aggressor that attacked it.
And now an interesting question - who is Ukraine fighting with now? Because Russia does not have enough strength to seize the relatively small Ukraine, it uses elite units of the North Korean troops on the battlefield against Ukraine, as well as armored vehicles, air defense systems and millions of shells from North Korea. Therefore, in fact, there is a war between Russia and North Korea against Ukraine.
1. This is NATO's war with Russia and Ukraine was chosen as the battlefield with the aim of containing Russia's power, exhausting them, bogging them down in war to hinder their development.
2. Ukraine is not a member of NATO, how can they deploy troops on Ukrainian territory? In addition, NATO does not dare to confront Russia directly because if it fails, they will lose prestige in the international arena. So they decided to use Ukraine as a scapegoat and whether the campaign succeeds or fails, they will lose nothing. Russia is supposed to be the top military power, it is naive to think that they can be defeated easily.
If NATO really wanted to help Ukraine, why would they only send old, outdated, limited-quantity weapons when they know how strong the Russian military is? Is it because Ukraine's mineral resources are limited rather than infinite?
3. More than 20% of Ukraine's territory is controlled by Russia and if this war continues, Ukraine may no longer be on the world map. That's why Trump wants this war to end and Ukraine will be the one to suffer the most but at least they will keep their country.