China’s newly announced Special Port Dues on “U.S.-related” vessels could affect as many as 3,120 international ships, equivalent to roughly 3 percent of the global merchant fleet, according to a new Clarksons Research report. The measure, set to take effect on October 14, coincides with the U.S. Trade Representative’s own port fee policy, underscoring a widening maritime dimension to U.S.–China trade tensions.