As Presidents Xi Jinping and Donald Trump prepare for a highly anticipated summit, both China and the United States say their ties have been broadly stable in recent months — and they are planning on keeping it that way. But many issues are at stake in one of the world’s most consequential relationships, with no easy end in sight. Few expect major breakthroughs to the long-running frictions between China and the U.S., which range from competition in technology to the thorny question of Taiwan, whose main unofficial ally is the U.S. Ending the war with Iran is likely to be added to the agenda, with Beijing being one ... (full story)