The conflict in Yemen is entering a new phase. The Houthi rebel group that controls much of the country is launching a new offensive in an oil rich region of the country. Meanwhile, the Biden administration has breathed new life into international diplomatic efforts to end the war by ending US support to the Saudi Arabia lead military campaign.  This episode examines how the Yemen conflict has evolved over the years and where it may be headed next.  Guest: Gregory D. Johnsen, Brookings Institute and former member of the UN Security Council's Panel of Experts on  Yemen.