Biden and Xi condemn Russian nuclear threats; Zelenskiy visits liberated Kherson –as it happened

US and Chinese presidents agree nuclear war should never be fought', White House says; Zelenskiy accuses Russia of more than 400 war crimes. This live blog is now closed

• At a glance: what we know on day 264 of the invasion

Hanna Arhirova is in Kherson for Agence France-Presse, and she has spoken to 73-year-old Yevhen Teliezhenko. He and his wife have been driving around the city, flying their Ukrainian flag and asking the soldiers who liberated them to autograph it.

They were fighting for us. We knew we were not alone," he said. Finally freedom!" said 61-year-old Tetiana Hitina, Teliezhenko's wife. The city was dead."

This is Martin Belam taking over the live blog in London. I will be with you for the next few hours.