The scenes are chaotic: Russian tanks veering wildly before exploding or driving straight into minefields, men running in every direction, some on fire, the bodies of soldiers caught in tank tracks. Victory for Moscow here would make it harder for the Ukrainians to shut down a nearby railroad that links Donetsk with Russian-occupied Crimea and allow the Russians to begin a northern “hook” as part of their anticipated spring offensive. ”However, some Ukrainian units have been running short of munitions as the tempo of Russian operations has increased