This will probabably sound over the top, and it's not the sort of thing I would have found myself saying 5 years ago, but I am now convinced that the war against Russia is not just for the defence of Ukraine: it is for the defence of Western civilisation.
Russia's degenerate, medieval culture cannot be allowed to prevail against the greatest civilisation history has ever known, even if only by proxy (e.g. the defeat of Ukraine, which is strictly speaking not part of Western civilisation, but at least aspires to our values).