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This year's war games between the U.S. and South Korea are the largest ever. In response, North Korea's Kim Jong Un threatened to unleash a "preemptive nuclear strike of justice."

Every few years, official clocks around the world repeat a second. It's not much, but in an age of atomic clocks it's time enough to give the matter a second thought.

The U.N. had initially estimated that 4 million Ukrainians would flee Russia's war — a number that was exceeded last month. Overall, more than 10 million people have been displaced by the conflict.

The United Nations said most of those killed in the conflict with Sunni insurgents were civilians. In addition, more than 300 were killed in southern Iraq after car-bomb attacks.

Pyongyang said once finished, it will wait for a green light from leader Kim Jong Un. Meanwhile, North Korea's military called President Trump's latest threats "a load of nonsense."

The comet, known as C/2014 UN271 (Bernardinelli-Bernstein), has an estimated diameter of about 80 miles. That's bigger than Rhode Island and about 50 times larger than the heart of most comets.

It's the first time this century that La Niña has returned for three consecutive years, according to the UN's weather agency. The pattern influences weather events worldwide.

The president of the European Union is calling on countries to welcome their share of what the U.N. predicts will be at least 850,000 migrants over the next two years.

Britain reportedly has withdrawn its remaining special forces, days after a similar U.S. move, in response to the worsening security that the U.N. envoy for Yemen described as the "edge of civil war."

The U.N. says Sudan — and three other countries — are the scene of catastrophic famine. What are the causes?