BEIJING — China has launched a formal challenge at the World Trade Organization (WTO) against the United States’ decision to impose a 10% tariff hike on Chinese imports, the Ministry of Commerce (MOC) announced Tuesday, denouncing the move as a breach of global trade rules and an assault on multilateral cooperation.

In a sharply worded statement, an MOC spokesperson accused Washington of “egregious unilateralism and trade protectionism,” arguing that........

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