The United Nations raised around $1.2 billion from crisis-strained donors on Monday towards its $4.3 billion aid plan for Yemen, one of the world's biggest humanitarian disasters despite a no-war, no-peace stalemate that has largely stopped fighting. Underfunding has seen agencies scale back Yemen aid projects, including food rations, in the past couple of years. Last year, donors gave $2.2 billion of the $4.27 billion sought, UN data shows.