China’s rapid arsenal expansion and Russia’s threats to use tactical nukes make old game theory models obsolete, forcing the U.S. to rethink how to deter two major rivals at once. https://www.japantimes.co.jp/commentary/2025/08/04/world/nuclear-experts-are-at-a-loss/?utm_medium=Social&utm_source=mastodon #commentary #worldnews #us #china #russia #northkorea #nuclearweapons #defense