The White House have expressed concerns that Russia might use chemical weapons to speed up the invasion of Ukraine. But where does their intelligence come from? Chemical weapons expert, Hamish de Bretton-Gordon, weighs up the evidence...

And we catch up with Anna, who made it out of Kharkiv with her family.

This episode of Ukrainecast was made by Estelle Doyle with Alix Pickles, Ben Cooper and Michele Theil. The studio director is Emma Crowe. The assistant editor is Sam Bonham.