U.N. calls for investigation into apparent poisoning of Putin critic Alexei Navalny

The United Nations is demanding a full investigation into the apparent poisoning of Alexei Nalvany, a prominent critic of Russian President Vladimir Putin. Navalny is finally out of a medically induced coma at a hospital in Germany. Investigators believe his tea was spiked with a Soviet-era nerve agent. CBS News foreign correspondent Charlie D'Agata joins CBSN from London with the latest developments.