Pretty simple, they ask the US if they wish to have Assange extradited or not. If they don't, then Sweden can say to Ecuador that Assange will not face extradit

Pretty simple, they ask the US if they wish to have Assange extradited or not. If they don't, then Sweden can say to Ecuador that Assange will not face extradition to the US for anything he has hitherto committed. If they do, then Sweden should just fucking admit it.