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Russia's relations with the west have been poor for some time but now they have reached a new level of hostility. Since the imprisonment of Russian opposition leader Alexei Navalny, new sanctions have been imposed by both the US and EU. The Ukraine conflict, allegations of cyber attacks and covert operations – the list of unresolved issues is growing. Stephen Sackur speaks to Vladimir Chizhov, Russia's ambassador to the EU. Is confrontation with the west President Putin's strategic choice?