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.

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.

A year after Russia’s invasion, Ukraine is suffering a catastrophic humanitarian crisis. The outflow of millions of refugees has placed a strain on neighboring countries.

Warming relations between the two pariah states could foster a mutually beneficial weapons and technology trade and raise tensions on the Korean Peninsula.