Hong Kong CNN — China has challenged a move by the United States to block sales of advanced computer chips and chip-making equipment to Chinese companies by launching a trade dispute at the World Trade Organization, calling the measures “trade protectionism.” The country’s commerce ministry filed a formal complaint against the United States with the WTO on Monday, according to a statement. The two countries are both members of the trade body, which has a mechanism for resolving disputes. “China’s filing of a lawsuit at the WTO is to resolve China’s concerns through legal means and is a necessary way...