Suppliers to U.S. aerospace and semiconductor firms face worsening rare earth shortages, with two turning away some clients, industry insiders said, weeks before U.S. President Donald Trump is expected to meet his Chinese counterpart Xi Jinping for a summit in Beijing.

The shortages center on rare earths such as yttrium and scandium, niche members of the family of 17 elements, which play tiny but vital roles in defence technology, aerospace and semiconductors and are almost entirely produced in China....

While Beijing has allowed many rare earth exports to resume since it imposed restrictions in April, shipments of these materials still rarely make it to the U.S. despite the October detente with Washington, Chinese customs data show.

https://www.reuters.com/business/aerospace-defense/rare-earth-shortages-worsen-us-aerospace-chips-despite-trade-truce-sources-say-2026-02-26/

Giving the US rare earth is like giving a psychopathic homicidal murderer a gun. Eventually he's going to use it on you.
So China is smart cutting the US from rare earth to use in its weapons industry. They'll use the rare earth to build they weapons that they are promising they'll use on China by 2030.

Beijing is a fool to sell it to their enemies.