Late in May, North Korea exploded its second nuclear device. It had recently tested its long-range Taepo Dong (U.S. designation) missile in satellite-launching mode, and it test-fired several shorter-
range missiles. At about the same time Iran successfully tested a two-stage solid-fuel missile, Sajil II, which can reach as far as Israel and Egypt. Both tests were widely condemned, and the South Koreans announced their support for the Proliferation Security Initiative (PSI), under which North Korean ships carrying missile components can be stopped at sea (under a United Nations Security Council mandate).