An escalation in violence in Yemen is sparking fresh concerns over the humanitarian situation in that country — and bringing up questions about Canada’s weapons contract with Saudi Arabia. We talk to Ahmed Mahat, head of mission for Yemen for Médecins Sans Frontières; Thomas Juneau, assistant professor at the University of Ottawa’s Graduate School of Public and International Affairs, and author of the book Le Yémen en guerre (Yemen at war); and Ardi Imseis, assistant professor of law at Queen’s University, who spent 12 years as a UN official in the Middle East and has helped investigate Yemen's civil war.