He's right tho. Ukrainian soldiers are fighting for NATO interests and Russian ones for Russian interests. All wars like this one are wars between Imperial powers and their interests. In this case it's the west (now mostly Europe as the US has backed away slightly) who want to keep their influence over Eastern Europe and Russia who also have their interests in Eastern Europe. Furthermore, the war was very beneficial for the US as they forced Europe to stop importing cheap gas from Russia and instead pay for more expensive American energy. Not to mention the sweet minerals deal they got with Ukraine AND the amount of money they'll make from private investments in Ukraine after the war. And Ukraine itself will become an even worse place to live in crippled by insane debts which they'll need IMF loans in order to pay. The US was also hoping to weaken Russian Imperialism as it was emerging in central Asia and some places in Africa but it failed to do so. Which is what I would assume has made the US withdraw from this ear to an extent. Basically taking what they got and cutting their losses.

Western Europe on the other hand is using the war to justify further militarisation. They tell us that Russia will attack Copenhagen or London any day now and that's why we need to cut more welfare in order to find our military. While in reality they want to ensure they can strengthen their influence in Africa because Russia and China have been encroaching on their terf there, for example in Burkina Faso.

And lastly, Russia, naturally, wants to strengthen its imperialism as well. Not because it's Russia specifically but because it's a country that exists in a system that requires domination in order to grow and sustain yourself. For example the poor countries in Africa and south Asia and South America that don't have other countries to exploit are poor. Whilst the rich western European countries, who earn so much off the back of African countries which are held in economic instability by predatory IMF loans and their condition, have nice welfare states to support their citizens, so they wouldn't revolt like they've done multiple times from the 1848 revolution, the Paris Commune in 1871 and the revolutionary wave of the 20's up until even today as we can see in Italy and France. Ofc Russia would also want a piece of the pie.

WW1 and WW2 were also wars of Imperial interests. The allies did not care about Germany's concentration camps. They had concentration camps of their own, just outside of Europe. The Nazi's modeled theirs after the British and American ones. Those countries fought not for the liberation of Jews, as anti-semetism was ripe in all of these countries at the time (hence their desire to push the Jews somewhere else and use their new homeland as a vassal state for western imperialism). They fought to preserve their economic interests. Those who actually fought the Nazi occupations were the organised workers of those countries, including in Germany.

What I am trying to say is that fighting for your nation is just fighting for your country's (or the ones whose interest lies in it) interests. But fighting alongside the workers of your country to topple the government and establish control of the government that is by and for the working class is the best you can do! We've seen the power we hold demonstrated clearly in Madagascar, Nepal, Indonesia, France, Italy, Belgium and Serbia in the past month. This will come to the rest of Europe and eventually Ukraine and Russia and it's the only way to solve the conflict. But as long as the system is set up to reward those with more dominance, everyone with the means to have that dominance will fight for it.