NATO leaders are shocked by U.S. Vice-President J.D. Vance's recent beratement of European allies at the pivotal Munich Security Conference. As the U.S. recedes, there are questions about who will fill the void as Russia continues to flex its influence around the world. Matt Galloway talks to Kerry Buck, former Canadian ambassador to NATO, about the potential impact on Ukraine’s long-term security, the alliance’s unity and what Canada should do next.