Brazil has long sought a greater role on the world stage, but political upheaval and other enduring challenges have complicated its efforts.

The federal agency has a broad mandate to protect Americans’ health and an expansive global reach. But the COVID-19 pandemic has been one of its most daunting challenges.

World powers continue to punish North Korea with economic sanctions, but the pressure has so far failed to push Pyongyang toward denuclearization.

Kim Jong-un has accelerated North Korea’s buildup of nuclear and other weapons of mass destruction, while also modernizing its large conventional force.