Russian troops, including soldiers disguised as Ukrainians, briefly broke through the frontlines in the northeast, a sign that Moscow is successfully pressuring Kyiv. Four waves of Kremlin fighters descended on the re-conquered city of Kupiansk on Wednesday,

Russia’s military is employing World War One-style tactics, involving relentless human wave attacks and heavy artillery, to make incremental gains in eastern Ukraine, notably around urban centers like Vuhledar.