welcome to world news america in the uk, on pbs, and around the globe. we begin the programme with a bird s eye view of security issues, both here in the us and around the world, and it s been a busy week. the presidents of russia and china put up a united front against the west. questions swirled over the origins of covid. the pentgaon says the us took proportionate action when carrying out air strikes on thursday against iran backed forces in syria. that s after a us contractor was killed when a drone hit a coalition base in syria s northeast. and of course, we had thursday s marathon session in congress, where the head of tiktok faced a grilling over whether chinese authorities have access to americans data. our chief presenter sumi somaskanda just spoke to the head of the us