Ukrainian President Volodymyr Zelenskyy has accused Russia of an "obvious policy of genocide" especially in the eastern region of Donbas, where there have been mass killings and deportations.
"The current offensive by the occupiers in Donbas could make the region uninhabited."
Ukrainian officials acknowledged on Thursday that some of their units may have to fall back saying Russian forces have recently combined short-range ballistic missiles, multiple-launch rocket systems, heavy artillery and tanks to bombard areas in Luhansk and Donetsk that are still under Ukrainian control.
In Kharkiv towards the north, nine people were reportedly killed on Thursday and 19 others injured from "dense shellings."
This comes amid reports that hundreds of thousands of Ukrainians have been forcefully and systematically taken to Russia from so-called "filtration camps."
The aggressions have prompted Ukraine to demand advanced, long-range rocket systems from the United States which CNN reports the White House is "leaning towards sending" as part of a larger package of military assistance, which could be announced as soon as next week.
Zelenskyy, meanwhile, has expressed his dissatisfaction at divisions within the European Union over imposing more sanctions against Russia and lamented what he called "procrastination."
"Of course I am grateful to those friends who are advocating new sanctions. But where do the people blocking this sixth package get their power from?"
The EU is discussing a sixth round of punitive measures, which include an embargo on Russian oil imports.
The move requires unanimity but has faced opposition from Hungary on the grounds its economy would suffer.
Zelenskyy's comments came a day after the leader slammed suggestions that Kyiv make territorial concessions for peace, comparing them to attempts to appease Nazi Germany in 1938.
Han Seong-woo, Arirang News.