I'm not arguing that it hasn't been a proxy war. Of course, NATO doesn't want a global superpower to take over another country. It sets a precedence. Just like they(we) wouldn't want China to freely take over Taiwan.
Sabatoged peace talks? All the peace talks included Russia taking over at least some of Ukraine's land. At which point, they slowly move their borders, encapsulating Ukraine piece by piece, year by year. Submitting to "Peace Talks" in which Russia is able to take some kind of Ukrainian land is submission to Russia.
Ukraine didn't invade Russia. Russia should have simply never invaded Ukraine. Ukraine can fight this with whatever they can get from around the world.
Ukraine didn't invade Russia. Some countries have hostile borders, this isn't uncommon. Invasions to take over the government isn't the solution, but Russia has made the bed that they're gonna lay in. Allowing Russia to take Ukraine sets a dangerous precedence.