Just a return to the status quo ante and no penalties or recriminations?
Military invasion for territorial conquest and declaring that people and nations do not have ‘the right to exist’ must be repudiated. Like Saddam’s invasion of Kuwait declaring it Iraq’s 26th province and his invasion of Iran’s oil fields. Both were simply a smash and grab for natural resources.
If Russia’s invasion of Ukraine is tolerated the world collapses. A free for all. Back to the days of Might = Right. Russia’s provinces are already fighting one another.