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The D.E.A. announced “a major new initiative” with Mexico to fight cartels. President Claudia Sheinbaum of Mexico said that was news to her.

By Jack Nicas and Emiliano Rodríguez Mega

Reporting from Mexico City

The news release from the Drug Enforcement Administration trumpeted a “bold bilateral initiative” with the Mexican government to crack down on cartels that smuggle drugs across the southern border.