US President Donald Trump and South Korean President Moon Jae-in "gravely condemned" North Korea's latest missile test on Thursday and promised "stronger" sanctions on Pyongyang during a phone conversation on Sunday, a South Korean government spokesman said after the call.
USA options range from everything to accepting North Korea as a nuclear power to using military force in a bid to destroy its arsenal and even oust leader Kim Jong Un.
The remarks also came after H R McMaster, the US' National Security Adviser, reaffirmed that the Trump administration has military options in place for dealing with North Korea.
"After seeing our capabilities, I am more confident than ever that our options are not only effective but overwhelming", Trump said.
But, unlike past presidents, Trump is promoting his "America First" agenda, and he has called for slashing US financial contributions to the United Nations. "We will defend our people, our nations, and our civilization, from all who dare to threaten our way of life. This includes the regime of North Korea, which has once again shown its utter contempt for its neighbours and for the entire world community", he said.
A Hwasong-12 medium-range ballistic missile "zoomed to the sky with dazzling flash and big explosion" and "crossed the sky above Hokkaido of Japan along the preset flight track and accurately hit the preset target waters in the Pacific", Xinhua news agency cited the report as saying. But the North American Aerospace Defence Command (NORAD) had said the ballistic missile did not pose a threat to North America.
"The two leaders agreed to work closely and to put stronger and more effective sanctions and pressure on North Korea in cooperation with the worldwide community", South Korea's presidential spokesman Park Soo-hyun said.
Trump also says long gas lines are forming in North Korea, calling it "too bad".
During telephone talks Friday, Abe and Moon agreed to ensure close trilateral coordination with the United States in stepping up pressure on North Korea, according to the Japanese Foreign Ministry.
United Nations Secretary-General Antonio Guterres called on the DPRK leadership "to cease further testing, comply with the relevant Security Council resolutions, and allow space to explore the resumption of honest dialogue on denuclearisation".
"I think they're deepening their isolation, economic and diplomatic".
"I think foreign leaders expect Trump to have some harsh words for the United Nations", said Richard Gowan, a United Nations expert with the European Council on Foreign Relations.
"I personally think he slaps the right people, he hugs the right people, and he comes out with (the) USA being very strong, in the end", Haley, speaking at the White House, said of Trump's speech.
Responding to a question, Mattis said he is not aware of any effort on the part of South Korea to shoot down the North Korean missile.
The missile guidelines Seoul and Washington agreed to in the 1960s had imposed limits on the range and payload of South Korean missiles.