What is a no-fly zone, and why won't the U.S. enforce one over Ukraine?

The United States and NATO have, so far, rejected Ukrainian President Volodymyr Zelenskyy's pleas for a no-fly zone over his country. Here is a look at what a no-fly zone is, how it works and why there isn't one for Ukraine.

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LIVE: Latest news, breaking stories and analysis on May 27 - CBS News.

LIVE: Latest news, breaking stories and analysis on May 27 - CBS News.

The law enforcement response to Tuesday’s deadly elementary school shooting in Uvalde, Texas, is under scrutiny, the National Rifle Association begins its annual convention in Houston following two mass shootings in less than two weeks and closing...

Officer sprints to stop vehicle after driver suffers medical episode.

Officer sprints to stop vehicle after driver suffers medical episode.

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Abbott skipping in-person NRA convention appearance: CBS News Flash May 27, 2022.

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Trump family must testify in New York fraud investigation, appeals court rules.

Trump family must testify in New York fraud investigation, appeals court rules.

An appeals court ruled that Donald Trump and two of his children, Donald Trump Jr. and Ivanka Trump, must comply with subpoenas and testify in a civil investigation by the New York attorney general's office. CBS News investigative reporter Graham ...

At least 4 dead in house explosion in Pennsylvania

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At least two others were injured in the explosion in Pottstown. Two people may still be unaccounted for, local officials said. CBS Philly's Kerri Corrado has the latest from the scene. CBS News Streaming Network is the premier 24/7 anchored stream...