South Korean defense officials and the U.S. Strategic Command say North Korea test-fired a "medium- or intermediate-range" ballistic missile early Sunday morning local time, which flew eastward for about 300 miles from the west coast of North Korea, over the peninsula and landed in the Sea of Japan. This marks the first missile test by the Kim Jong Un regime since October, and the first under the new Donald Trump presidency.Japan's Prime Minister Shinzo Abe, appearing in a hastily arranged press conference with Trump following the test, said the move was "absolutely intolerable" and called on North Korea to fully comply with United Nations Security Council resolutions, which forbid Pyongyang from these types of tests."The United States of America stands behind Japan, its great ally, 100 percent," Trump said, and took no questions.The U.N. resolution — and repeated sanctions — have failed to curbthe Kim regime, which test-fired missiles more than 20 times last year, and more than 50 since Kim Jong Un became leader five years ago.South Korea convened an emergency national security meeting Sunday morning in response to the launch. South Korea's Acting President Hwang Kyo-ahn said Seoul will work with the international community "to punish [the North] accordingly.""North Korea's repeated provocations show the Kim Jong Un regime's nature of irrationality, maniacally obsessed in its nuclear and missile development," the South's foreign ministry said in a statement.While the missile tested Sunday did not have the range to reach farther than Guam, North Korea has been racing ahead in developing its nuclear program. North Korea watchers have been on alert for a possible intercontinental ballistic missile test. An ICBM, as it's known, could have be loaded with a nuclear warhead and if successful, could reach the continental United States. As NPR's Geoff Brumfiel noted last month: