Ukraine

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 State Partnership Program has quietly become a powerful tool for diplomacy and modeling U.S. values around the world.

On Mother's Day, Biden met with Ukraine's first lady, Olena Zelenska, who has been in hiding with her children since Russia's invasion began.

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.

U.S. first lady Jill Biden spent Mother's Day in Slovakia, meeting Ukrainian mothers who have been displaced by Russia's war and assuring them that the "hearts of the American people" are behind them.

The school was sheltering about 90 people in the village of Bilohorivka.

Elena Dunder is unable to return back to Odesa, Ukraine, after Russians invaded her country during her stay in Florida.

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.

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

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

The EU chief concedes that that getting all 27 member countries — some of them highly dependent on Russia for energy supplies — to agree on oil sanctions will be extremely difficult.

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.