Dr Peter Dean on the UN's strategy to criminalise foreign fighters worldwide (ABC News)

US president Barack Obama has urged those who have joined Islamic State militants in Syria and Iraq to 'leave the battlefield while they can'. He led the UN Security Council in unanimously approving a binding resolution on stemming the flow of foreign jihadists.

ABC's Beverley O'Connor speaks with Dr Peter Dean, from the Strategic and Defence Studies Centre and Fulbright scholar in Australia-United States Alliance Studies.

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