Russia's 'existential struggle' in Ukraine

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Sergey Karaganov, a former senior advisor to Presidents Yeltsin and Putin, talks about Russia's 'existential crisis' in Ukraine and relations with the West. Our Turkey correspondent Mark Lowen heads to Diyarbakir in the Kurdish heartlands on his Turkey election road trip and the collapse of a terrorism trial in the UK collapses raising questions on British policy in Syria and the involvement of the secret services.