china has admitted that it needs to improve its covid vaccination rate for people aged over 80. analysts say a lower take up among elderly people could be one reason why beijing is reluctant to end its zero covid policy. iran has admitted to supplying a limited number of drones to russia, but has continued to challenge claims that these have been used in the war in ukraine. iranian state media reports that although tehran did supply moscow with the weapons a few months before the conflict, there s no evidence that had been used. the us has said that remains of iranian shahed 136 or kamikaze drones have been found on the ground in ukraine, along with evidence that iranian military personnel have been assisting russia in their use. ukraine s president zelensky has said iran needs to come clean about the extent of its involvement in the conflict. sarah kreps is director of the tech policy institute at cornell university and a senior fellow at the brookings institution. she joins us no