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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 unclear if the soldiers have been taken prisoner or are under the protection of the U.N., but a Ukrainian official says they would be able to return home after a prisoner exchange with Russia.

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

North Korean Foreign Minister Ri Yong Ho says that under international law, his country can legally shoot down U.S. military planes — even if they're not in North Korea's airspace.

Blackwater, a private security firm, wants to provide peacekeeping services in Darfur. Private contractors have been hired to provide security in Iraq and other places, with mixed results. But Blackwater says it could work under multinational supervision and help reduce civilian suffering.

As Russia continues to relentlessly bomb Ukrainian cities, the task of delivering aid to civilians there is becoming more challenging.

At a time when South Sudanese need aid more than ever, staffers from one of the biggest humanitarian groups in the country were expelled — with no explanation.

The U.N. says hundreds of millions of dollars are needed to help the millions of people impacted by the earthquakes in Turkey and Syria. There's concern that donor fatigue could impact support.

There is still no sign of a cease-fire in Gaza after more than two weeks of fighting. Sporadic gunbattles between Israel and Hamas continue, and the U.N. says tens of thousands of internally displaced Gaza civilians are struggling to find shelter from the fighting.