INTERVIEW: What are the ramifications of the Oval Office row last week?

The fallout between US President Donald Trump and his Ukrainian counterpart Volodymyr Zelenskyy in front of the world's media in the Oval Office last week is being seen as a major test for Europe. Professor Peter Dean is the Director of Foreign Policy and Defence at the US Studies Centre at Sydney University and in this One on One episode, he's speaking to SBS's Rena Sarumpaet.