Rescuers picked through the rubble of an apartment building in eastern Ukraine searching for two dozen people, including a child, feared trapped after a Russian rocket strike on the five-story building killed 15 people.

Ukrainian President Volodymyr Zelenskyy's chief of staff, Andriy Yermak, said the attack in the town of Chasiv Yar in the Donetsk region was "another terrorist attack" and Russia should be designated as a state sponsor of terrorism.

Rescuers used a crane to lift a concrete slab and their hands to dig through the debris on Sunday, while dazed residents who survived the Saturday evening attack retrieved personal belongings and told stories of their miraculous escape.