"Russia will not stop until they are forced to do so"

Russia will not stop until they are forced to do so – that was the opening remark from Danish Prime Minister at a European Leaders summit.  EU leaders have been calling to boost European defence after a series of Russian incursions into EU airspace, and days after drones targeted Danish airports.  But can the 27 EU countries work together as the threat of Russian aggression continues to loom over Europe?   Guest: Anand Menon, director of The UK in a Changing Europe and professor of European politics and foreign affairs at King’s College London.