As a member of the West, of course it is. That's why the US along with allies have set up all sorts of sanctions towards Russia and are feeding Ukraine with intel and weapons to defend their country. You can call it a proxy war and it has components that go beyond the military, but it's a war nonetheless.
There's simply a lot at stake here, including the fate of the US dollar as a reserve and trade currency, alignment of powers in the indo-pacific region, the future of our biggest allies in Europe, the future of Taiwan, etc. Russia is also making a claim to be a superpower, which they no longer are. They're just a bigger North Korea these days, both on the political and economic realms. A clear message has to be sent that the days of 20+ years dictators is over, whether they have nuclear weapons or not.