Did I miss NATO declaring war on Russia and N. Korea? Or are we OK with the Chinese silently torpedoing the next batch of military equipment to Taiwan (a rouge province under intl law)?
Your argument, taken to its limit, is might makes right. Which, fine; but we're just not that strong anymore. Certainly not the EUpeeans.
What's the point of declaring war in a war?
Russia invaded Ukraine just fine without ever declaring war.