The article explains that the war games pertain to regional theatre wars, eg- defending Taiwan or the Baltics, which are threatened perennially by China and Rus

The article explains that the war games pertain to regional theatre wars, eg- defending Taiwan or the Baltics, which are threatened perennially by China and Russia respectively. The impact on US alliances and various global structures would be huge. Big enough that you want to prevent them, but not big enough to get into a full-scale nuclear exchange over. Tldr: Nukes don’t solve all conflict, not even all major conflict.