One person was killed and eight were injured as civil and industrial infrastructure were hit in the eastern city of Kharkiv on Friday, said Kharkiv mayor Igor Terekhov. Several explosions were also heard in the Ukrainian capital Kyiv, and the Ukrainian Air Force said Russia had launched a massive missile attack on the country. 

A wave of Russian strikes against Ukrainian cities on Friday shows the country needs "more support" from the international community, Ukrainian presidential aide Andriy Yermak said. "We are doing everything to strengthen our air shield. But the world needs to see that we need more support and strength to stop this terror," Yermak wrote on Telegram.

(With input from agencies)