The mass casualty theater attack in Moscow was a reminder that affiliates of the Islamic State have reorganized and infiltrated even powerful states.

A year into the civil war in Sudan, more than eight million people have been displaced, exacerbating an already devastating humanitarian crisis.

Iranian support has boosted the military prowess of Yemen’s Houthis, helping them project force into the Red Sea. In return, the group has extended the reach of Iran’s anti-West axis of resistance.

Years after defeating the Islamic State on the battlefield, world governments are now grappling with what to do with the thousands of war-related detainees in Syria.

Cuba’s authoritarian regime has failed to avert an economic crisis, repair decaying state institutions, and prevent the country’s largest outflow of migrants since the 1960s.

News of Iran’s upcoming release of U.S. nationals and the unfreezing of Iranian assets has stirred speculation of a new nuclear deal. But there are many obstacles to such a breakthrough.