Despite facing territorial losses, the Islamic State shows no sign of relenting in its campaign to spread terror beyond Iraq and Syria, says journalist Rukmini Callimachi.

Iraq’s campaign to liberate Mosul from the Islamic State and restore the Iraqi government’s authority requires coordination among numerous armed groups with competing interests.

The Obama administration has other methods to pursue a binding international agreement on climate change in Paris that fall short of a treaty, says CFR’s John B. Bellinger III.

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.