Disagreement over rare earth minerals is at the center of trade talks between the U.S. and China in London. Algene Sajery, a fellow at the National Security Institute, joins "CBS News 24/7" with more.

Chinese exports of rare earths—17 key minerals at the heart of trade tensions with Washington—rose 23% in May compared to the previous month, customs data showed Monday. May shipments totaled 5,865 tons—still below last year’s level—but the monthly surge lifted year-to-date exports by 2.

The US trade war with China has a major sticking point: rare earths minerals. Last month, President Donald Trump said the United States needed Greenland “very badly,” renewing his threat to annex the Danish territory.