U.S. National Security Advisor Jake Sullivan makes first visit to China

For the first time in 8 years, the U.S. President's point man on national security is in China. The visit is Sullivan's first to China in his current capacity. What does the visit tell us about the current state of China-U.S. relations? Is the world's most important bilateral relationship showing signs of improving stability? With U.S. elections just months away, how useful will this mechanism be?