Ukrainian service members load shells into a tank at a position near a frontline, amid Russia's attack on Ukraine, outside the town of Bakhmut, Donetsk region, Ukraine October 4, 2022.
Zelenskiy, speaking in an evening address, also said Russian missiles and drones had continued to hit Ukrainian cities, causing destruction and casualties.
Russian forces have repeatedly tried to seize Bakhmut, which sits on a main road leading to the cities of Sloviansk and Kramatorsk.
A very difficult situation persists in the Donetsk region and Luhansk region," Zelenskiy said.
Zelenskiy said Russian forces, which rained cruise missiles on several Ukrainian cities on Monday, had hit targets in seven regions over the last two days.