A roundup of key developments and the latest in-depth coverage of Russia's invasion of Ukraine.

Chancellor Olaf Scholz warned peace is impossible under Russian dictatorship, saying "freedom and security will win the day, just as freedom and security triumphed over oppression, ... 77 years ago."

Students from Ukraine are among the finalists in this week's Regeneron International Science and Engineering Fair. They're researching topics from cancer treatments to cockroaches.

The tiny Jack Russell terrier is credited with detecting hundreds of Russian explosive devices since the start of the war. His other pastimes include snacking on cheese and napping at press briefings.

In 1932, The New York Times' Walter Duranty won a Pulitzer for stories defending Soviet policies that led to the deaths of millions of Ukrainians. The Times disavows his work but not the prize.

Russians celebrate Victory Day on Monday, May 9. The annual event marks the Soviet Union's victory over Nazi Germany in World War II, but it has taken on added importance this year because of Ukraine.

Ukraine is one of the world's biggest producers of wheat, corn and sunflower oil. Officials say 30% of farmland is now occupied or unsafe. "My fields were destroyed by the shelling," one farmer says.

The final battle for Mariupol is taking place inside the Azovstal steel plant, a massive coastal complex in the besieged city. Hundreds of civilians are still trapped inside, officials say.

The EU ban on Russian oil imports will likely lead to higher crude and gasoline prices, further upending energy markets.

The European Union wants to sharpen its sanctions against Russia. But its leaders acknowledge Europe's economy could suffer.

Ukrainian and international experts believe it will take years, if not decades, to build cases and prosecute people. Ukraine's prosecutor general's office has opened more than 9,000 investigations.

Russian forces have been active in multiple former Soviet republics this year, a reflection of Russian leader Vladimir Putin's desire to maintain a 'sphere of influence' beyond Russia's borders.

The actress and U.N. Special Envoy for refugees spoke with recent evacuees arriving by train in the western Ukraine city, as well as children being treated for injuries from a recent Russian attack.

Israeli officials are calling for an apology after Sergey Lavrov said the Hitler "had Jewish origins." It's the strongest condemnation of Russia by Israel since the war in Ukraine began in February.

Estonia is host to one of the world's largest annual interactive cybersecurity drills. Russia is always considered the main threat, but this year, the war in Ukraine has only added to the stakes.