Do you know about most of the NATO countries trying to take Kosovo away from Serbia, which is another "separate independent country" as we speak? Why is there no outrage about that? Where were Iraqi flags in people's profiles when USA killed half a million children there for imaginary weapon of mass destruction? Btw you don't really need to sign anything, borders of countries members of the United Nations are protected and guaranteed by the UN. A rule that USA and other NATO countries violated continuously over the past 50 years.
Also, you can't realy wage a war without having civilian casualties. It's a sad fact. Civilian casualties in Ukraine are less than 8.000 which is a very very small number considering we are talking about country of 50 million people being in an all out war.
Repeating the fairytale of international law is meaningless. It's like judging one football team for not playing nice while the other team is out to get them with knives and bombs. Are they supposed to just sit there and just watch Ukrainian Nazis burn Russian children alive?
Let's face it, it was never about holly Ukrainian borders, I find it incredible that social justice warriors are worried about other countries borders exclusively in this war and in absolutely no other case. It's the fact that western liberal pro LGBT people despise Russian culture so much that they will find a way to declare Russia the bad guy in every possible scenario. You can see people in this very thread spamming trendy gifs without even considering any fact that goes against their predetermined narrative.
500 million dead children in Iraq no one says a word. 8 thousand dead civilians in a year of war in Ukraine and everyone is committing hours every day to spread the word of the great evil that Russia presents. Very convenient.