The Ukrainian government says it is working to restore the country's energy infrastructure that has suffered extensive damage in recent Russian attacks.

Russia's defense ministry said that its forces carried out large-scale missile attacks on Thursday on Ukraine's energy-related facilities and other targets.

Ukrainian Prime Minister Denys Shmyhal said that Moscow's continuous assaults on Ukraine's critical infrastructure have damaged almost half of the country's energy system.

President Volodymyr Zelenskyy said in a video message on Friday, "The difficult situation with energy supply persists in a total of 17 regions and in the capital."

Meanwhile, Moscow and Kyiv have agreed to extend a deal that allows grain exports from Ukraine's Black Sea ports.

But grain shipments have been stalled due to a shortage of vessels and equipment as well as missile strikes by Russian forces.

In the southern port city of Odesa, trucks waiting to unload wheat are forming a long line that extends several kilometers.