AP
In this Friday, Feb. 2, 2018, photograph, Yemeni militiamen and a soldier allied to the country's internationally recognized government offer Friday prayers as a Kalashnikov rifle sits in front of them on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, two Yemeni soldiers allied to the country's internationally recognized government walk near the wreckage of destroyed military vehicles on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, a Yemeni militiaman allied to the country's internationally recognized government looks over the wreckage of a destroyed piece of mobile artillery on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, Maj. Gen. Nasser Ali al-Daibany of Yemen's internationally recognized government shows journalists a deactivated mine on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, Yemeni soldiers allied to the country's internationally recognized government stand guard in Marib, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, Yemeni soldiers allied to the country's internationally recognized government stand guard in Marib, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, a Yemeni militiaman allied to the country's internationally recognized government stands guard in the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, a young Yemeni man leaves a shop in Marib, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Saturday, Feb. 3, 2018, photograph, an official portrait of Yemen's internationally recognized President, Abed Rabbo Mansour Hadi, hangs above Muslim clerics gathered for a meeting in Marib, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018 photograph, Yemeni soldiers allied to the country's internationally recognized government drive a tank on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, a Yemeni soldier allied to the country's internationally recognized government fires a truck-mounted anti-aircraft gun on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, Yemeni militiamen and soldiers allied to the country's internationally recognized government climb a mountain in the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, a man waves at a checkpoint held by forces loyal to Yemen's internationally recognized government in the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, young boys stand at a checkpoint held by forces loyal to Yemen's internationally recognized government in the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, Yemeni militiamen and soldiers allied to the country's internationally recognized government pass through a mountain checkpoint in the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, a Yemeni soldier allied to the country's internationally recognized government unslings his machine gun in the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, Yemeni soldiers allied to the country's internationally recognized government talk near the front lines of the Yemen war on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, two Yemeni soldiers allied to the country's internationally recognized government walk on a mountainside exposed to territory controlled by the Yemen's Shiite Houthi rebels below on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, two Yemeni soldiers allied to the country's internationally recognized government wait near the front line of the Yemen war on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photograph, a Yemeni soldier allied to the country's internationally recognized government smokes on the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell
In this Friday, Feb. 2, 2018, photo, Yemeni militiamen allied to the country's internationally recognized government prepare to climb a mountain in the outskirts of Sanaa, Yemen. Yemen's conflict, which began as a civil war in 2014 and escalated into a regional proxy fight, drags on today. Winning the hardscrabble terrain takes time and costs dearly, only exacerbating the country's humanitarian crises and making a war that's seen over 10,000 people killed last that much longer. (AP Photo/Jon Gambrell)
- Jon Gambrell