China Adds 15 American Companies to Export-Control ListDrone maker Skydio is among several U.S. companies targeted in China's retaliation. (Clara Mokri for WSJ)On Tuesday, China's Ministry of Commerce said it added 15 American companies to an export-control list and expanded the number of U.S. firms on its “unreliable entity” list. Several U.S. defense-technology companies were put on the export-control list, the ministry said in a statement. They include drone maker Skydio, as well as Andreesse...