As crises in the Middle East escalate, food has become a weapon of war.A new Associated Press analysis published Friday looks at the way food supply and access is controlled by all sides in conflict and the devastating impact this tactic has on civilian populations struggling to survive behind blockades in Syria, Yemen, and Iraq.The AP reports:The biggest humanitarian catastrophe by far is Syria, where a ruinous five-year civil war has killed a quarter of a million people and displaced half the population. All sides in the conflict have used punishing blockades to force submission and surrender from the other side — a tactic that has proved effective particularly for government forces seeking to pacify opposition-held areas around the capital Damascus.Earlier this month, United Nations (UN) aid groups visited several besieged Syrian towns on a humanitarian mission. That included Madaya, a town northeast of Damascus with a population of 40,000, where recently released images of the starving populace—particularly the malnourished children—gained international attention.After returning from that trip, UN Secretary General Ban Ki-moon said the use of food as a weapon in conflict constitutes a \u0022war crime.\u0022\u0022U.N. teams have witnessed scenes that haunt the soul,\u0022 Ban said. \u0022The elderly and children, men and women, who were little more than skin and bones: gaunt, severely malnourished, so weak they could barely walk, and utterly desperate for the slightest morsel.\u0022While sieges are considered by the military to be a viable tactic to prevent further unrest in conflict zones, the forces carrying out the blockades are expected to operate under international humanitarian law.The AP continues:The United Nations estimates more than 400,000 people are besieged in 15 communities across Syria, roughly half of them in areas controlled by the Islamic State group. In 2014, the U.N. was able to deliver food to about five percent of people in besieged areas, while today estimates show the organization is reaching less than one percent.In 2015, the World Food Program [WFP] was forced to reduce the size of the food rations it provides to families inside Syria by up to 25 percent because of a funding shortfall. The agency says it has to raise $25 million every week to meet the basic food needs of people affected by the Syrian conflict.In Yemen, some 14.4 million civilians—more than half the population—are \u0022food insecure,\u0022 a jump of 12 percent in eight months, according to the UN\u0026#039;s Food and Agriculture Organization. An additional 7.8 million face \u0022life-threatening rates of acute malnutrition.\u0022Access to water and fuel also remain scarce in the country, according to the WFP. And a new report by UN experts, published earlier this week, found that Yemenis are being subjected to tactics that \u0022constitute the prohibited use of starvation as a method of warfare.\u0022WFP executive director Ertharin Cousin on Wednesday told the UN security council that the organization\u0026#039;s work in Syria was being disrupted because the UN was falling short of its own resolutions \u0022not to impede or hinder\u0022 humanitarian assistance efforts.\u0022To prevent people from imminent starvation, we need the support and action of every Council Member and every Member State,\u0022 Cousin said. \u0022Preventing mass starvation requires more than a four-town agreement.... Preventing a humanitarian crisis as well as a food security and nutrition crisis requires a cessation of attacks on civilian infrastructure.\u0022It requires \u0022freedom of movement for all civilians and the immediate lifting of all sieges by all parties,\u0022 Cousin continued. \u0022This is the only way to end hunger and to treat malnutrition.\u0022James Sadri, director of the Syria Campaign, a peace advocacy group, told the media outlet Syria Deeply earlier this month that the UN was failing Syrians in a \u0022dramatic way.\u0022\u0022People are now talking about Madaya, but there are 1 million people currently living under siege, where starvation is being used as a weapon of war,\u0022 Sadri said.