China has placed sweeping new restrictions on rare earth materials and equipment in a move that could deny U.S. companies and defense contractors access to critical building blocks in their supply chains. The export controls, laid out on Thursday in two notices issued by China's Commerce Ministry, were a subtle shot across the bow to President Donald Trump ahead of his summit with Chinese counterpart Xi Jinping , with a bilateral trade agreement on the line. China commands a 60 percent share in

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