Diplomatic and economic measures taken to rein in North Korea's missile programme have not had the desired effect, a senior US military commander said on Thursday after the North's latest test triggered a flurry of calls among world leaders. "We have no further comment", he added.
The firing was also made as North Korea expressed anger over annual military drills between the United States and South Korea that North Korea sees as an invasion rehearsal.
The U.S. president has said Beijing can do more to rein in North Korea.
A senior US intelligence official told NBC News that North Korea is estimated to have between eight and 10 nuclear weapons while other analysts say the number is likely between 10 and 20.
"The United States has spoken enough about North Korea".
Separately, the USA military's Pacific Command confirmed the launch in a statement on Tuesday.
United States officials said the missile launched on Wednesday appeared to be a liquid-fueled, extended-range Scud missile that only travelled a fraction of its range before spinning out of control.
The Trump administration has reportedly concluded its North Korea policy review, but there seems to be a great deal of uncertainty about how President Donald Trump will constrain the regime's nuclear weapons development.
Feb. 12 In February, North Korea successfully tested a land-based version of a KN-11 missile, a solid-fuel rocket, which traveled 310 miles into the Sea of Japan.
The South Korean government reacted by convening its National Security Council and ordering its troops to a higher state of readiness, while the Japanese government issued a strongly worded condemnation of Pyongyang's latest act of provocation.
Mr Trump has said China holds the key to curbing North Korea and even threatened unilateral action in a recent interview.
US President Donald Trump and Chinese President Xi Jinping will discuss North Korea in Florida this week.
The US House of Representatives has approved a request by the Department of State to put North Korea back on the list of countries sponsoring terrorism, after the country was removed from it in 2008.
The 60 kilometers is a relatively short flight compared with the distances that other North Korean missiles flew.
"US Pacific Command is fully committed to working closely with our Republic of Korea and Japanese allies to maintain security", the military command in the Indo-Asia-Pacific region said.
It comes after the North fired four ballistic missiles last month, three of which landed in waters that form part of Japan's exclusive economic zone.
Did North Korea really want to steal the show ahead of the Trump-Xi summit? North Korea called that test a success, but some outside analysts said it might test the weapon again before deploying it.
In a statement, the European Union called on North Korea to resume talks with the global community, "to cease its provocations and to abandon all nuclear weapons and existing nuclear programmes as well as other weapons of mass destruction and ballistic missile programmes".