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As you well know, Russia crossed the borders to protect Russians and pro-Russian Ukrainians who had been living there for years. And Russia did it at the request of the people living in those areas, which Ukraine had been attacking for no real reason. Those areas are now part of Russia, even if world cartographers aren't willing to admit it yet.
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So? Even if that is the case, it does not give the right to Russia to invade Ukraine, not matter the position of the local population, the federal/nation authorities and the whole people of Ukraine also have a say on the destiny of those territories. What if an important percentage of Mexican-Americans decided to call Mexico to invade and take over California and New Mexico? Would the United States stay still and do nothing ?
Obviously, we all know that is not how thing could ensue, and Mexico would not believe to be entitled to those territories, not matter what the people living in them believed.
Well, of course, there was more reason. How would Americans feel if Russia took over Canada and Mexico.
Western Europe and the US have been trying to steal Russia from the Russians since the time of the Bolshevik Revolution. This time they are using Ukraine to do it. The people of Ukraine want to stop the war. But the West and their puppet, Zelensky, won't let it stop.