STORY: Sievierodonetsk, Lysychansk, Popasna, remain the most difficult places, Zelenskiy said in a video statement on Tuesday evening.
“The situation on the front lines hasn’t changed much over the last 24 hours”, he said, adding that Russian troops were bringing in new resources towards Donbas and Kherson.
Since being pushed back from Kyiv and Kharkiv, Russia has focused on the region known as the Donbas, comprised of Luhansk and Donetsk provinces, and closest to the Russian border.
Moscow says it is engaged in a "special military operation" to disarm and "denazify" its neighbor.
Ukraine and allies call this a baseless pretext for a war that has killed thousands, flattened cities and forced millions of people to flee. Zelenskiy said Ukraine would launch next week a "Book of Executioners" to detail war crimes.
"These are concrete facts about concrete individuals guilty of concrete cruel crimes against Ukrainians," he said.
Russia says it has gone out of its way to avoid targeting civilians in its operation in Ukraine.