The national bourgeoisie use those patriotic feelings to manipulate the working class into slaughtering their actual brothers and sisters across borders.
Or perhaps different countries have different geopolitical interests which sometimes drive them to inflict violence upon eachother in pursuit of those interests
The people facing the exact same conditions, the exact same assault on their living conditions, the exact same war imposed on them.
Sweden and Finland have massively better living conditions than Russia and both have governments which were elected by the people. The illuminati you speak of are also either not very strong there or are incredibly benevolent considering how good the social programs are.
Ukraine and Russia were both victimized heavily by socialists, causing their shitty economic system today, but Ukraine is attempting to align itself with the west, geopolitically and economically, so that it can reap the same economic benefits that the rest of their brothers in Eastern Europe, Scandinavia, Western Europe, North America, and Asia are all reaping from having free market economies and extensive international trade. The oligarchs in control of Russia don’t like this, because Ukraine has too many resources, is too close, and is too geographically valuable to lay outside of their empire, so they impose this war upon the Ukrainian and Russian people so that they can secure their interests. And of course, Ukrainians don’t like this, and neither does the West, so the Ukrainians fight back and we help them.
To be an internationalist isn’t to devalue a connection to the community of fellow workers in your country, it’s to extend it across borders.
To be an internationalist is to ignore all of human history and psychology in pursuit of a utopian pipe dream.