HCNN - Is WW3 coming? NATO is Preparing for a Bigger Fight

This week, NATO Military Committee Chairman Rob Bauer said the alliance is "prepared for a confrontation with Russia." Military Historian Mark Moyar, author of "Triumph Regained: The Vietnam War, 1965-1968," says a more extensive war is possible, but the U.S. should apply some lessons learned from the Vietnam War to Ukraine.