The launch occurred hours before Independence Day began in the United States. In 2006, as the July 4 holiday was still being celebrated, North Korea test-fired six ballistic missiles.
On Twitter late Monday, Mr. Trump was apparently referring to North Koreaâs leader, Kim Jong-un, when he wrote: âNorth Korea has just launched another missile. Does this guy have anything better to do with his life? Hard to believe that South Korea and Japan will put up with this much longer. Perhaps China will put a heavy move on North Korea and end this nonsense once and for all!â
Mr. Trump has been trying, so far without success, to enlist China to pressure Pyongyang to curtail its nuclear and missile programs.
North Korea last launched a ballistic missile from Kusong on May 14, when it tested what it called a new weapon that could carry a large, heavy nuclear warhead. The intermediate-range Hwasong-12, believed to have a longer range than any other North Korean missile tested until then, landed in the sea between the North and Japan. It flew 489 miles and soared to an altitude of 1,312 miles. At the time, North Korea said that the missile was launched at a deliberately high angle so it would not fall too close to a neighboring country, and that if launched at a normal trajectory, it could target American military bases in the Pacific. Some outside analysts have reached a similar conclusion.
North Korea also launched what the Pentagon called âa medium- or intermediate-range ballistic missileâ from the Banghyon air base on Feb. 12. The missile, which was identified as a Pukguksong-2, flew 310 miles. North Korea has said Pukguksong-2 could carry a nuclear payload. The missile was also fired from a mobile-launch vehicle and used a solid-fuel technology that missile experts said will make it easier to hide it and launch on short notice.
The Pukguksong-2 test was conducted as Mr. Trump was hosting Japanâs prime minister, Shinzo Abe, on an official visit.
In remarks to reporters, Mr. Abe called for a strengthening of âunity of the international community.â He also specifically appealed to Presidents Xi Jinping of China and Vladimir V. Putin of Russia to âhave a constructive response to North Korea.â
North Korea has been trying to build a reliable intermediate-range ballistic missile, which would be able to reach American military bases in the Pacific. At the same time, it has vowed to develop the ability to attack the United States with nuclear warheads, although it has never tested an intercontinental ballistic missile that could fly across the Pacific.
Missile experts say North Korea may still be years away from mastering the technologies needed to build a reliable intercontinental ballistic missile.