The top U.S. military commander in Afghanistan, Stanley McChrystal, warns that the conflict “will likely result in failure” unless additional troops are deployed and a new strategy developed. McChrystal is expected to request anywhere from 10,000 to 45,000 additional troops, beyond the 68,000 that have already been approved.

World leaders gather in New York this week for the U.N. general assembly; among them are new presidents of the U.S., Russia and China, Iranian President Mahmoud Ahmadinejad, and Libyan leader Muammar Qaddafi, attending for the first time. Issues to be discussed include climate change and nuclear proliferation.

President Obama will meet with Israeli Prime Minister Benjamin Netanyahu and Palestinian President Mahmoud Abbas on the sidelines of the U.N. general assembly on Tuesday, but does not have “grand expectations” for the meeting.

More than 140 rebels are killed as the Yemeni army fights back a major offensive in the northern city of Sadah. The clash is the bloodiest since Houthi rebels began fighting with goverment forces in 2004.