Ukraine will next week mark the 30th anniversary of the Chernobyl disaster, when human error and flawed Soviet reactor technology led to the world's worst nuclear accident.

Ahead of the April 26 anniversary, AFP looks at the steps taken since 1986 to improve nuclear safety around the world and -- as Fukushima showed in 2011 -- the challenges that remain.

With Sunday's vote in the lower house of Congress to authorize the Senate to open an impeachment trial against President Dilma Rousseff, Brazil's political crisis enters ever deeper crisis.

Here's a snapshot of how Latin America's biggest country got there -- and what's next.

U.S. Republican presidential frontrunner Donald Trump has rung alarm bells around the world with his proclamations on foreign policy, but his targets are increasingly shrugging off his barbs.

By suggesting that NATO is "obsolete" and that Japan and South Korea should acquire nuclear weapons to rid the United States of the burden of protecting those countries, Trump has called into question some of the cornerstones of U.S. foreign policy for decades.

When Bernie Sanders called Israel's response in the 2014 Gaza war disproportionate and urged America to be more balanced on the Israeli-Palestinian conflict, he smashed a presidential campaign taboo.

His remarks at the April 14 Democratic debate ahead of New York's decisive primary on Tuesday amounted to unprecedented criticism of Israel and promotion of Palestinian rights from a canvassing U.S. presidential candidate.

The first time jihadi recruiters approached 16-year-old Yacine outside his mosque in a rundown Paris suburb, they got right to the point.

"We started talking about Syria right off the bat," he said, recounting how they talked about "the holy war and how you should die a martyr and go to paradise, it was the best way to die."

More than a week after 276 schoolgirls were kidnapped from the remote northeast Nigerian town of Chibok by Boko Haram on April 14, 2014, a lawyer posted the first #BringBackOurGirls tweet.

Ibrahim Abdullahi's hashtag would go on to become one of Africa's most popular online campaigns and was shared more than four million times over the next month on Twitter. 

It featured drama and tension fit for a telenovela: A bouffant-haired, billionaire-turned-politician clashing with a famous TV journalist intent on getting answers.

The jaw-dropping scene played out on live television in August, when White House hopeful Donald Trump threw famous Mexican-American reporter Jorge Ramos out of a news conference.

One North Korean who worked abroad says that as a waitress in China, she was forced to put up with male customers who groped her and tried to get her drunk. Two others recall the frozen bodies of their countrymen stored in Russian logging camps. Another says he toiled for up to 16 hours a day at a Kuwaiti construction site surrounded by wire fences.

As difficult as those lives were, the four workers told The Associated Press, it beat staying in the North. The jobs actually conveyed status back home, and were so coveted that people used bribes and family connections to get them.

When she was being tortured under Brazil's military dictatorship, Dilma Rousseff could never have imagined becoming the country's first female president.

But four decades on from those dark days in 1970, when Rousseff belonged to a violent Marxist underground group, she did indeed rise to the top -- only to face impeachment less than a year into her second term.

Two elderly men in chequered headdresses, a Syrian army officer and a Russian colonel sat at a plastic table by a desert road signing sheets of paper.

"In the name of Allah the most merciful" read a Russian translation of the agreement, with the title "Application form to join the cessation of hostilities" printed across the top.