China's promise to delay its newest restrictions on the export of the rare earths that are crucial to many high-tech products for one year as part of a trade agreement President Donald Trump secured creates an opportunity for the U.S. and its allies to bolster their own production and processing capabilities. But it will be hard to undercut China's stranglehold on the market.

The restrictions China imposed on rare earths this year have been a key issue in the trade talks between Beijing and Washington. Trump responded angrily to China's latest rules with a threat to impose an additional 100% tariff on all Chinese imports, but he has since dropped that demand as part of this agreement.

This week's deal will delay the regulations that would have required foreign companies to get special ap

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