U.S. leaks show clash between 'need to know' vs 'need to share'

The latest U.S. intelligence leak illustrates a paradox of spycraft: keeping secrets means limiting their distribution but protecting against dangers like another Sept. 11, 2001, attack means sharing them.

Balancing those twin demands is a key challenge for U.S. President Joe Biden as his administration seeks to prevent leaks while protecting U.S. security and ensuring allies fearful of exposure keep sharing intelligence.

The conflict has been raised anew following the FBI arrest on Thursday of Jack Teixeira, a 21-year-old U.S. Air Force National Guard employee, in connection with damaging online leaks...