#USChinaTradeTalks In May, the two sides agreed to drastically roll back tariffs on each other’s goods for an initial 90-day period. The mood was upbeat. However, sentiment soured quickly over two major sticking points: China’s control over so-called rare earths minerals and its access to semiconductor technology originating from the US.

Beijing’s exports of rare earths and their related magnets are expected to take center stage Monday at the London meeting. A person familiar with the matter told CNN the US-China talks were underway. China’s official news agency Xinhua also reported the start of the discussions.