China's Xi Jinping told U.S. President Donald Trump that trade talks were making progress at the start of a two-day summit on Thursday but warned that disagreement over Taiwan could send relations down a dangerous path.

Presidents Xi Jinping and Donald Trump are preparing for a summit, with both China and the U.S. emphasizing stable ties.

China experts expect Trump and Xi may announce trade deals or other agreements, such as a Chinese purchase of U.S. agricultural products or Boeing aircraft.