Ukraine: Day four post-invasion, Putin raises nuclear spectre

Western powers have condemned Russian President Vladimir Putin's order to put nuclear forces on "special alert" - in response, he says, to NATO "aggression". The United States is calling it "totally unacceptable", and NATO's chief describing it as "dangerous" and "irresponsible". Ukraine's President Volodymyr Zelenskiy has confirmed a meeting is set to take place on the border of Belarus, between Ukrainian and Russian delegations, four days into the Russian invasion of Ukraine. Kathryn gets an update from Kiwi freelance journalist Tom Mutch.