Welcome to The Adversarial. Every other week, we’ll provide you with expert analysis on America’s greatest challengers: China, Russia, Iran, North Korea, and jihadists. Read more below. *** China U.S. National Security Advisor Jake Sullivan just returned from Beijing, but the U.S.-Chinese relationship remains stuck in neutral. Sullivan’s discussions with counterpart Wang Yi have been the most productive engagements between the two countries in the last four years. Yet, Sullivan’s dozen hours with Wang did not yield any public deliverables other than promises to hold additional meetings in the future. The most important of these include potential in-person summits between