A top U.S. military officer said there is an "extremely high" risk that hypersonic strike weapon technology being developed in China and Russia could proliferate to North Korea and Iran, a determination that is fueling efforts by the Defense Department to focus development on a new capability to defeat ultra-fast, maneuvering missiles. Missile Defense Agency Director Lt. Gen. Samuel Greaves told the Senate Appropriations defense subcommittee April 11 that he views the proliferation of a notional new-class of hypersonic weapons...
