In early June, at the behest of the Biden administration, German leaders assembled top economic officials from the Group of 7 nations for a video conference with the goal of striking a major financial blow to Russia.The Americans had been trying, in a series of one-off conversations last year, to sound out their counterparts in Europe, Canada and Japan on an unusual and untested idea. Administration officials wanted to try to cap the price that Moscow could command for every barrel of oil it sold on the world market. Treasury Secretary Janet L. Yellen had floated the plan a few weeks earlier at a meeting of finance ministers in Bonn, Germany.The reception had been mixed, in part because other cou …
