Millions of Yemenis saw an opportunity for change in 2011.

Protesters inspired by the Arab Spring demanded the resignation of President Ali Abdullah Saleh.

He eventually relinquished after three decades in power, but hopes of democracy soon faded.

Four years of civil war has led to what the United Nations calls the world's worst humanitarian crisis - with famine, disease and suffering widespread.

Hakim Almasmari - Political and military mediator, and Editor in Chief of the Yemen Post

Karl Schembri - Regional Media Adviser in the Middle East, Norwegian Refugee Council

Sama'a Al-Hamdani - Yemen political analyst, Visiting Fellow at Georgetown University

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