New Delhi, July 3 -- Hours after Russia launched a drone and missile barrage targeting Ukraine and killing 27 people overnight, Moscow and Kyiv on Thursday (local time) vowed fresh assaults in their over-four-year war.

The attack on the Ukrainian capital, Kyiv, tore apart apartment buildings and sent tens of thousands of people to shelters, with Kyiv's mayor describing it as the "enemy's most massive attack on the capital," AFP reported.

Ukrainian President Volodymyr Zelenskyy said the country would "definitely" retaliate for the overnight strikes as he carried out inspections at an apartment block that was partially destroyed.

Tymur Tkachenko, the head of Kyiv's military administration, confirmed that 27 people had been killed and at ...