ARTICLE AD BOX
By Abdujalil Abdurasulov in Kyiv and James FitzGerald in London
BBC News
Ukraine is suffering more blackouts after cities and energy facilities were hit with fresh Russian aerial attacks.
Officials said missiles and Iranian-made drones were used in a "massive attack" launched from air and sea.
They added that up to 35 S-300 rockets - which are difficult to intercept - were fired on the Kharkiv and Zaporizhzhia regions.
In the aftermath, one presidential adviser reiterated a call for the west to provide fighter jets.
Russia had been hitting Ukraine "all night and morning", Mykhailo Podolyak tweeted. He criticised "political hesitation" over the provision of new arms to his country.
The latest attacks come a day after President Volodymyr Zelensky met EU leaders to appeal for fighter jets - following another visit to the UK, for the same purpose.
Explosions were reported on Friday morning in Kyiv, where residents were urged to take shelter in metro stations.
Air defences were engaged in the capital, as well as Odesa, Poltava and other cities, Ukrainian authorities said. They added that five missiles and five drones were shot down.
There was no information immediately available about potential casualties.
State-owned power company Ukrenergo said its infrastructure had been hit in eastern, western and southern regions, causing power cuts in some areas.
Moscow has repeatedly targeted Ukraine's energy facilities over the winter.