Australia’s decision to cancel its French submarine contract in favour of partnering with the US and the UK on nuclear-powered boats has provoked local and international controversy. The decision has implications for US, Chinese, European and Southeast Asian diplomacy and defence policies. Richard McGregor, the Lowy Institute’s Senior Fellow for East Asia, talks with three experts: Bilahari Kausikan, the former head of the Singapore Foreign Ministry, Yun Sun, of the Stimson Centre in Washington DC, and Nadège Rolland, of the National Bureau of Asia Research in the United States.