South Korea's Foreign Ministry called the North's latest missile launch a "reckless provocation" that poses a threat to worldwide peace, while Japan's Chief Cabinet Secretary Yoshihide Suga said the country lodged a strong protest over the launch.
The test, which sent a missile into the sea off North Korea's east coast Wednesday, occurred ahead of a hugely important meeting between the leaders of the US and China this week and has been described by one analyst as an insult from Pyongyang to US President Donald Trump and his Chinese counterpart Xi Jinping.
In Washington, the White House said Trump spoke about the North's latest missile launch.
Tensions have escalated over North Korean moves to accelerate its weapons development.
North Korea is barred under United Nations resolutions from carrying out ballistic missile launches or nuclear tests.
North Korea's nuclear and missile programmes will be high on the agenda when Trump and Xi meet at Trump's Mar-a-Lago resort in Florida later on Thursday, with anger in Beijing simmering over the deployment of an advanced U.S. anti-missile system in South Korea. North Korea fired a ballistic missile into its eastern waters Wednesday.
"North Korea may push ahead with a nuclear test either before or after the U.S".
"I've joked before that they don't mind being hated but they definitely hate to be ignored", Cossa said.
Bisley said that while Trump has talked about being different on North Korea, Tillerson's statement is the first public sign that there might actually be some departure.
The Trump administration has vowed progress on North Korea, and said it is willing to go it alone without China, usually seen as vital to putting pressure on Pyongyang. "And China will either decide to help us with North Korea, or they won't.If China is not going to solve North Korea, we will".
The North's latest missile launch also came during annual military drills between the United States and South Korea.
North Korea has carried out several SLBM tests near Sinpo. The reclusive state has also conducted two nuclear weapons tests since January 2016.
North Korea is scheduled to convene a Supreme People's Assembly session on Tuesday, the day when ruling party Chairman Kim Jong Un officially assumed the country's highest position five years ago.
Following a meeting of South Korea's National Security Council, Acting President Hwang Kyo Ahn's office said it would respond strongly to any further provocations by North Korea.
The launch appeared to be successful although it flew only 60 kilometers (37 miles) from the east coast after shooting up to an altitude of 189 kilometers.