The US special envoy to Sudan, Tom Perriello, warns other countries not to seek to benefit from the conflict there. Khartoum, he said, needed aid not arms.Also in the programme: are sanctions against Russia working? And sea urchins under threat.(Picture: Adam Hassan, who has an album with pictures of his son and father, who he said were killed by the RSF and Arab militias in the West Darfur town of Murnei in June, sits outside his makeshift shelter in Adre, Chad. Credit: Reuters)