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

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

Here’s how different health-care systems, including single-payer and government-run, have contended with the coronavirus.

The swift development of effective vaccines against COVID-19 was an unprecedented scientific achievement. But production challenges, vaccine nationalism, and new variants have all presented hurdles.