In a world where rivalry has long drowned out dialogue, the U.S. Treasury secretary and China's vice premier met to explore something quietly remarkable: a shared warning system for artificial intelligence threats to national security. The two nations, bound by competition and divided by suspicion, found themselves acknowledging that some dangers do not respect borders or geopolitical allegiances. It was not a treaty, nor a resolution — but a willingness to speak, which in this moment may be its own form of progress.