Thirty-five years on from the end of the Vietnam war, the devastating effects still linger.
Agent Orange, the chemical used by US forces during the war, is still poisoning the environment of the country and the health of its people, Vietnam says. The US says that cannot be scientifically proven.
The subject is sensitive for both countries, but Hillary Clinton, the US secretary of state who is attending a security summit in Vietnam this week, is expected to address the issue.
And as Tony Birtley reports from Danang, Vietnam, help from the US – which has so far refused to accept responsibility – may now be coming.