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Mexicans cast ballots on Sunday to elect their next president. The candidate well ahead of the others in polls is Andrés Manuel López Obrador, a leftist who has tried twice before for the presidency.

Biden told Putin in a call that if Russia invades Ukraine, the U.S. and allies would apply painful economic sanctions, said Jake Sullivan, Biden's national security adviser.

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

Heading into national swimming championships, the University of Virginia relies on a mathematician, cameras and sensors to help each swimmer perform their best.

Russia's invasion of Ukraine sent ripples beyond the immediate conflict zone, breaking supply chains and creating food shortages as two of the world's biggest food exporters went to war.

By some estimates, there are millions of people working in an informal economy in Mexico. Many are street vendors who ply their trades in the neighborhoods of the capital. They have no access to loans or financial support.

High gas prices have set off calls for conservation and investigation of price gouging. But among residents of Arizona, high gas prices have also provoked some less predictable reactions.

NPR's Susan Davis speaks with Howard Bryant of Meadowlark Media about the Stanley Cup Finals, Brittney Griner's detention in Russia, and who's joining the Saudi Arabia-backed LIV golf league.

The United States isn't the only country troubled by how to mark leaders of a divisive and racist past. South Africa is also examining what to do with statues to its apartheid-era leaders.

In Tuesday's Republican primaries, Trump-backed candidates won up and down the ballot in Nevada, while he saw a split in South Carolina, where he endorsed challengers to two GOP incumbents.