US Also Tried Stuxnet Against North Korea
According to a Reuters article, the US military tried to launch Stuxnet against North Korea in addition to Iran:
According to one U.S. intelligence source, Stuxnet’s developers produced a related virus that would be activated when it encountered Korean-language settings on an infected machine.
But U.S. agents could not access the core machines that ran Pyongyang’s nuclear weapons program, said another source, a former high-ranking intelligence official who was briefed on the program.
The official said the National Security Agency-led campaign was stymied by North Korea’s utter secrecy, as well as the extreme isolation of its communications systems.