Ukraine said its troops have marched farther east into territory recently abandoned by Russia, paving the way for a potential assault on Moscow's occupation forces in the Donbas region as Kyiv seeks more Western arms.

"The occupiers are clearly in a panic," Ukrainian President Volodymyr Zelenskyy said in a televised address late Monday, adding that he was now focused on "speed" in liberated areas.

"The speed at which our troops are moving. The speed in restoring normal life," Zelenskyy said.