Australia's Turnbull government has released a new defence white paper containing the affirmation of the purchase of 12 new submarines. There have been previous indications that these would come from Japan, but much has changed in both domestic and international politics in this time.

Professor Nick Bisley (Executive Director, La Trobe Asia) tells Matt Smith why Japan will be the provider of Australia's submarines and the ripples it could make in international diplomacy.

Follow Nick Bisley on Twitter: www.twitter.com/nickbisley

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