As we've been reporting, several Russian air strikes hit the Ukrainian capital Kyiv on Thursday as UN Secretary General Antonio Guterres visited the city to meet Ukraine's President Volodymyr Zelensky.

In a late-night address, Zelensky condemned the attack, saying it "says a lot about Russia's true attitude to global institutions".

Ukraine's president accused Russia's leadership of trying to "humiliate the UN and everything that the organisation represents," adding it "requires a strong response."

Russian attacks in other cities across the country, including Fastiv and Odesa "once again prove that we cannot let our guard down", he said.

"We cannot think that the war is over. We still have to fight. We still have to drive the occupiers out," he added.

Zelensky stressed it was important that the UN chief visited sites of mass graves in Borodyanka, and the Kyiv region, to see "with his own eyes what the Russian occupiers had done there".