KOSTYANTYNIVKA, Ukraine -- Ukrainians in the city of Kostyantynivka, near the eastern front line in Russia's war on Ukraine, are in constant danger. Russian forces in the Donetsk region are trying to advance from several directions, probing for weak spots in defenses. The Kremlin wants to cut off Ukrainian forces' access to supply routes, which make this city a prime target. Since Russian forces made advances in early August around Pokrovsk, some 60 kilometers away, Ukraine has been focusing on turning back the incursion, with only partial and grinding success. Daily Aerial AttacksKostyantynivka, a key link in keeping Ukrainian forces supplied, has come under daily aerial attacks by Russian artillery and drones.