US President Donald Trump said Chinese leader Xi Jinping has agreed to restart the flow of crucial rare earth materials, after announcing a new round of US-China trade talks will be held in London on Monday.

China views its rare earths as a national security issue, not a trade one, and that’s why Beijing is unlikely to loosen controls anytime soon, experts say.

President Donald Trump says his first conversation with Chinese leader Xi Jinping since returning to the White House had a “very positive conclusion," announcing the two countries will hold trade talks in hopes of breaking an impasse over tariffs and global supplies of rare earth minerals.