A swarm of Russian drones flies into Poland in what officials there regard as a deliberate provocation. NATO responds by bolstering the alliance’s air defenses on its eastern flank. Moscow showcases its conventional and nuclear military might in long-planned exercises with Belarus, as it warns the West against sending foreign troops into Ukraine. These events — all taking place in the month since the U.S.-Russia summit meeting in Alaska failed to bring peace to Ukraine — have only heightened