Ukraine's General Staff said the strikes were a "deliberate, targeted striking" of the hospital and that it appeared soldiers being treated there were injured.

This is the result of peace negotiations with Putin,” said one Ukrainian, after a Russian attack in Dnipro killed four people and injured more than 20 on Saturday.

A Russian drone strike on Ukraine's second-largest city killed two people and wounded 35 late on Saturday, officials said, as President Volodymyr Zelenskiy urged Kyiv's partners to respond to such attacks while seeking peace in the three-year-old war.

Russian drones hit a military hospital, shopping centre, apartment blocks and other buildings in Kharkiv overnight into Sunday, killing two people and wounding 30 others, Ukrainian officials said.

Ukrainian forces have responded to Russian efforts to expel them from one part of Russian territory by launching a large number of attacks on another border area, using drones, artillery and troops.