China’s restrictions on exports of crucial rare-earth metals and rare-earth magnets remain one of the most difficult unresolved issues as President Trump and Xi Jinping prepare to meet this week.

For months, manufacturers in the United States, Europe, Japan and India have complained about difficulties in obtaining enough rare-earth metals from China, which dominates global production. The materials are essential for making products ranging from cars and wind turbines to semiconductors, computer displays and military equipment.

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