Most of your claims are false.
And for argument sake if they were true, let's face it: Ukraine not only was independent since 1991, but it's territory integrity was guaranteed by Russia and USA.
I would only request that it should be viewed in context of its history. Especially if we might decide to enshrine the world in more war over it. It is in its current state a construct, without a foundation. To reach peace, a compromise must be reached.
'I would only request that it should be viewed in context of its history.'
THE context of its history is that Ukraine was independent longer than the USA exists. And even despite that fact, the post-soviet era requires borders to be intact in order to reach peace. If we'll let this go, that would mean that it is 'ok' to invade countries and we would fall down back into world wars times.
*And by invading countries, I mean grabbing someone's else land and declaring it your own.