Michael Carpenter: Is this a new age of conflict?

Vladimir Putin’s invasion of Ukraine represents the biggest seismic shock to European security since the collapse of the Soviet Union. The US, NATO allies and the EU are now arming the Ukrainian government. Stephen Sackur speaks to Michael Carpenter, US Ambassador to the Organisation for Security and Cooperation in Europe. Are we in a new age of conflict, and will Russia's invasion of Ukraine lead to a new, long-term cold war?