In one case, material stolen from a private company would help the development of technology to track ballistic and hypersonic missiles, U.S. officials said.

The movie about the daring mission to rescue American diplomats from Tehran portrayed a single C.I.A. officer sneaking into the Iranian capital. In reality, the…

U.S. officials say Chinese and Russian spy agencies are trying to steal technology from private American space companies and preparing cyberattacks that could disable satellites…