The attack in eastern Germany is another alarming example of how the terrorist threat is evolving, with more far-right perpetrators attempting to broadcast their brutality.

Tensions over Israeli treatment of Palestinians in Jerusalem have spurred the worst violence between the two sides in years, but the eruption seems unlikely to prompt a strong international reaction…

Scientists say the rain forest is approaching a critical tipping point at which the damage is irreversible.

With this major U.S.-Russia nuclear arms control agreement set to expire next year, Washington should coordinate with Moscow for a New START treaty extension to allow for further negotiations and the…

A changing climate and growing competition for resources is raising tensions among Arctic nations.