BEIJING: China has further tightened export restrictions on rare earths ahead of talks between United States President Donald Trump and President Xi Jinping at the end of the month.The country produces over 90 per cent of the world's processed rare earths and rare earth magnets and has used export restrictions to throttle shipments.The 17 rare earth elements are vital materials in products ranging from electric vehicles to aircraft engines and military radars.Here's what you need to know about the new rules:What did China announce?China already tightly controlled its exports of rare earths, but on Thursday (Oct 9) added five new elements, bringing the total subject to restrictions to 12.It also limited the export of dozens of pieces of equipment and material used to mine and refine rare earths, processes where it is the world leader.The restrictions force exporters to apply for licences. An earlier round of controls in April caused shortages of rare earth magnets, which led car plants around the world to pause operations.In a nod to fears of a repeat, China said it would facilitate licence approvals, but intended to reject applications related to defence and would closely scrutinise those related to advanced semiconductors and certain kinds of artificial intelligence. China quietly issues 2025 rare earth quotas: SourcesWhat does it mean for foreign producers? Beijing said for the first time that it intends to apply its regime to foreign producers who make certain rare earth products using Chinese material or equipment.Washington has had similar rules since the 1950s, using them in recent years to stop foreign semiconductor companies from selling chips to China if they are made with US technology.Rare earth producers anywhere in the world must now get approval from China for sales if they use the country's rare earth equipment. Rare earth magnet makers must do the same if their goods contain more than trace amounts of Chinese rare earths.The rules appear designed to entrench China's dominance over the rare earth supply chain and hamstring efforts to build alternatives.Commentary: Chips won the Cold War. Rare earths may win the nextFrance leads Europe’s push to reduce reliance on China for rare earthsDo the rules apply to any foreign producer using Chinese rare earths? No. China is only claiming global jurisdiction over the production of some rare earths and related magnets.So, a washing machine made in Germany with a Chinese rare earth magnet does not need permission from the Ministry of Commerce to be sold in other European countries.However, they would apply to a German company making rare earth magnets using Chinese rare earths.How could China enforce these new rules? It's unclear. Chinese law allows for penalties ranging from fines to imprisonment for breaking export control laws, but it would be difficult to prosecute foreign producers.For foreign rare earth companies reliant on Chinese material or equipment, falling foul of the rules could put them at risk of being cut off from Chinese suppliers.That risk is likely to add impetus to work already underway in the US and Europe to diversify away from the Chinese rare earths supply chain. Sign up for our newslettersGet our pick of top stories and thought-provoking articles in your inboxSubscribe hereGet the CNA appStay updated with notifications for breaking news and our best storiesDownload hereGet WhatsApp alertsJoin our channel for the top reads for the day on your preferred chat appJoin here