With the opening of the United Nations General Assembly on Tuesday, world leaders have descended on New York for an annual gathering that marks the beginning of the body's work for the year. It's a time for high diplomatic drama -- Iran and Syria are in the spotlight this year -- and a chance for presidents and prime ministers to air their grievances on a global stage. Brazilian President Dilma Rousseff opened the day's events with a denunciation of U.S. intelligence activities exposed by NSA whistleblower Edward Snowden. She was followed by President Barack Obama, who expressed measured optimism at the diplomatic gambit by Iran's leaders to restart talks aimed at resolving the stand-off over Tehran's nuclear program.
More fireworks are sure to come. The livestream is after the jump.
STAN HONDA/AFP/Getty Images