A categoric denial from the Russian Ambassador to the UK today, as Andrei Kelin tells Christiane that Moscow using nuclear weapons is “out of the question,” in a revealing interview. This after the British, American and French governments sent Moscow a stern warning this week, fearing Russia is preparing for an escalation in Ukraine by planting false flag alarms. But the ambassador’s firm stance may not calm fears; after all, Russian officials said all along they were not going to invade Ukraine, yet they did. Kelin is a veteran foreign service officer whose portfolio has included arms control and NATO relations, and he sat down with Christiane at the ambassador’s residence in London. 

Also on today's show: US Special Presidential Envoy for Climate John Kerry; Russian investigative journalist Yevgenia Albats.

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