With the front lines largely frozen, Russia and Ukraine have turned the war into a contest of economic endurance. Kyiv has gone after Russia’s oil refineries. Moscow has hit Ukraine’s ports and heavy industries. 随着前线基本陷入僵局，俄罗斯和乌克兰已将战争变成一场经济耐力竞赛。基辅打击俄罗斯炼油…