article_snippet.sent: Nearly four million Syrians have fled the conflict into neighboring countries, which warn Nearly four million Syrians are dangerously overstretched.
article_snippet.sent: United Nations High Commissioner for Refugees (UNHCR)
article_snippet.sent: United Nations reports that about 440,000 people are besieged in Syria's civil war, now in United Nations fifth year.
article_snippet.sent: Of those, 167,500 are trapped by government forces, 228,000 by Islamic State militants and the rest by other armed groups.
article_snippet.sent: Russia, a top Syria ally and backed by China, has vetoed multiple council resolutions on Syria, including an effort last year to refer the situation there to the International Criminal Court.
article_snippet.sent: U.N. Special Envoy for Refugees