Even after stealing the plan for an advanced warhead, one would need high-performance equipment to manufacture and test its precision parts.

Extracts from the dossier have been published previously, but it was not previously known that it included documentation on such an advanced warhead.

Officials have said, for example, that China stole design information about America's most advanced warhead, the W-88, between 1984 to 1988.

Anti-structure weapon with an advanced tandem warhead that can also be set between two modes.

Chinese pride has also been hurt by the suggestion that their own scientists could not develop advanced nuclear warheads on their own.

The JL-2 will probably be able to hit the United States from within China, and will also be equipped with small advanced warheads.

A18 The plea agreement leaves unresolved an eight-year inquiry into how China obtained secret information on an advanced nuclear warhead.

Law-enforcement and intelligence officials said Mr. Lee remained a suspect in the theft of data related to the design of America's most advanced nuclear warhead.

It is difficult to determine which source of information was the most important to the Chinese in their development of an advanced nuclear warhead.