Such breaches could enable China, national security experts said, to remotely disrupt important facilities in the Indo-Pacific region that in some form support or service US military operations.
"What she endured is unthinkable," Biden said of 4-year-old released hostage Abigail Edan.
The violent killing put a spotlight on the US civil rights cause after his mother, Mamie Till-Bradley, held an open-casket funeral and a photo of her son's badly disfigured body appeared in media.