Unrest and accusations of police brutality in Brazil’s slums have threatened Rio’s security—and the country’s image—as it comes under a global spotlight with the World Cup, says expert Janice Perlman.

An interim nuclear accord between Iran and world powers is still within reach despite lingering disagreements over details, says expert Barbara Slavin.

A deal to tame Iran’s nuclear program is within sight, but a number of potential pitfalls, including an untimely increase in U.S. sanctions, could derail diplomacy, says expert Suzanne Maloney.

In their first White House meeting on Tuesday, Presidents Obama and Park will likely seek to reassert the long-standing security and economic relationship between the United States and South Korea, s…

Russian President Putin, mistrustful of Western motives, is likely to resist pressure to commit to stronger sanctions against Syria’s government, says expert Dimitri Simes.