U.S. Treasury Secretary Janet Yellen sent a stark warning to China this week. She basically threatened China economically if it continued to tacitly support Russia. Unless Beijing uses its “special relationship” with Russia to help end the war, she said “it will be increasingly difficult to separate economic issues from broader considerations of national interest, including national security.” To emphasize, she said the world’s “willingness to embrace [China’s] further economic integration may well be affected by China’s reaction to our call for resolute action on Russia.” The previous threat was action against China if it helps Russia evade sanctions but this forewarning requires Beijin...