
United Nations Secretary General Ban Ki-moon speaks at a news conference ahead of the 69th United Nations General Assembly at U.N. headquarters in New York, September 16, 2014.
(Reuters) - World leaders gather in New York this week to tackle a host of crises: the violence Islamic State militants are wreaking in Iraq and Syria, the exponential spread of the deadly Ebola virus in Africa and deadlocked negotiations on Iran's nuclear program. 
 There is little hope the  193-nation U.N. General Assembly will achieve much in the annual  five-day marathon of speeches. But on the sidelines, U.S. officials plan  to lobby allies for pledges of concrete military assistance to help  defeat Islamic State, whose hardline Sunni Islamist fighters have taken  over swaths of Syrian and Iraqi territory. U.N.  Secretary-General Ban Ki-moon said more than 140 heads of state or  government will attend the assembly's annual "general debate", which  begins on Wednesday and ends Sept. 30. He noted an unusually large  number of serious conflicts: in the Middle East, Africa and Ukraine. "The world is facing multiple crises," Ban told reporters. "All  have featured atrocious attacks on civilians, including children," he  said. "All have dangerous sectarian, ethnic or tribal dimensions. And  many have seen sharp divisions within the international community itself  over the response." U.N. officials  and delegates say the top issue for Western and Arab leaders is the  rampage of Islamic State militants, who are blamed for a wave of  sectarian violence, beheadings and massacres of civilians. "Together,  we will address the horrendous violence in Syria and Iraq, where  conflict and governance failures have provided a breeding ground for  extremist groups," Ban said. U.S.  President Barack Obama is expected to use the U.N. podium on Wednesday  to call for more countries to join his coalition of more than 40 nations  to prevent IS from expanding its territory. The United States has been  bombing IS targets in Iraq for the past month but has yet to bomb Syria. The  White House said it was unlikely that Obama would meet with Iranian  President Hassan Rouhani while both are in New York this week. But  Secretary of State John Kerry is expected to meet with Iranian Foreign  Minister Mohammad Javad Zarif at which they are expected to discuss  Iran's atomic program and IS. On  Friday, Kerry told a special meeting of the Security Council that Iran  could play a role in helping tackle IS, an apparent shift in the U.S.  position. Both Iran and the United States have ruled out military  cooperation. EBOLA OUTBREAK In  addition to speeches by Obama, Rouhani and other high-profile leaders,  other important attendees making their U.N. General Assembly debut this  week include Egypt's President Abdel Fattah al-Sisi and Indian Prime  Minister Narendra Modi. On  Wednesday, Obama will chair a rare summit meeting of the U.N. Security  Council on the problem of foreign fighters. He last chaired a council  summit in 2009 on eradicating nuclear weapons. At  Wednesday's meeting, the council plans to adopt a resolution demanding  countries "prevent and suppress" recruitment and travel of foreign  fighters to join extremist militant groups like IS by ensuring it is a  serious criminal offence under domestic laws. Foreign fighters in IS are  believed to be the group's cruelest. U.N.  member states will also tackle the Ebola crisis in West Africa. Obama  and other leaders will also attend a high-level meeting on the  exponentially worsening hemorrhagic fever outbreak that has devastated  Liberia, Sierra Leone and other countries in the region. The  meeting comes just after the Security Council declared Ebola a "threat  to international peace and security" and established the first-ever U.N.  mission dedicated to tackling a public-health threat. Since  the current outbreak was first detected in March, Ebola has infected at  least 5,357 people, according to the World Health Organization, mostly  in Guinea, Sierra Leone and Liberia. It has also spread to Senegal and  Nigeria. The virus has killed an estimated 2,630 people. Liberian  President Ellen Johnson Sirleaf had been due to speak at the General  Assembly this week but canceled her trip to New York because of the  Ebola crisis. While the General  Assembly speeches are going on, senior foreign ministry officials from  the United States, Britain, France, Germany, Russia and China are  meeting in New York with Iranian officials. They will try to break a  deadlock in talks aimed at ending sanctions in exchange for curbs on  Iran's nuclear program. Foreign ministers from the six powers may join  the talks in the course of the week. Even  though a Nov. 24 deadline for a long-term deal is a mere two months  away, diplomats close to the talks say a deal in New York is unlikely. Just  ahead of the General Assembly on Tuesday, U.N. chief Ban will convene a  global summit meeting on climate change that aims to set the stage for a  major environmental conference in Paris next year. Obama is expected to  use the session to highlight strides the United States has made on  climate change. There will also be  high-level side meetings on conflicts in Syria, Libya, South Sudan,  Ukraine, the Central African Republic, Mali, the Israeli-Palestinian  problem, and the U.N. war on poverty.