China’s nationalist Global Times newspaper ran a cartoon captioned “Bully pulpit” showing Trump holding a megaphone, shouting “America First,” while the state-owned China Daily newspaper said Trump’s speech was “full of sound and fury”.

The silence from Japanese Prime Minister Shinzo Abe was particularly telling because he has been eager to agree with Trump’s every utterance on dealing with North Korea. A spokesman for Abe, Motosada Matano, declined to comment on Trump’s speech.

Chief Cabinet Secretary Yoshihide Suga said: “We greatly appreciate President Trump’s approach to changing North Korea’s policy stance, denuclearising the country and calling on the international community, including China and Russia, for their cooperation toward strengthening pressure on North Korea.”

Tokyo instead focused on Trump’s mention of Japanese citizens abducted by the North.

Watch: Trump threatens to ‘totally destroy’ North Korea

Suga welcomed Trump’s reference to a Japanese girl who was kidnapped by North Korean agents in 1977.

The plight of abductees is a key issue for Abe, who has pledged to rescue them while in office, and an emotive one for the Japanese public.

North Korea admitted in 2002 it had kidnapped 13 Japanese in the 1970s and 1980s to train spies. Five of them returned to Japan but Tokyo suspects that hundreds more may have been taken.

South Korean President Moon Jae-in, whom Trump accused of trying to “appease” North Korea by wanting to talk to the regime, has also been trying hard in recent weeks to show he is in sync with the American president.

Moon’s spokesman pointedly avoided reacting to Trump’s “total destruction” line, saying the speech underscored the urgency of dealing with North Korea and that Seoul believed Trump remained committed to peace.

“We believe he expressed a firm and specific stance regarding the important issue of maintaining peace and security now facing the international community and the United Nations,” the spokesman, Park Soo-hyun, said in a statement.

“Also, we believe he clearly showed how seriously the US government takes this issue by allocating an unprecedentedly long period of time to address the North Korean nuclear and North Korean issues in his UN address as a US president,” he said.

In his speech, Trump said that if Kim Jong-un’s regime continued to threaten the United States and to destabilise East Asia, his administration was prepared to use force.

“The United States has great strength and patience, but if it is forced to defend itself or its allies, we will have no choice but to totally destroy North Korea,” Trump said.

Tensions between the Trump administration and Kim’s regime have risen to new heights as North Korea has fired increasingly long-range missiles, including two that are theoretically able to reach the mainland United States, and detonated a hydrogen bomb.

As these tensions have mounted, Trump has warned Kim that he will feel the full “fire and fury” of the United States and that the United States was “locked and loaded.”

Successive American administrations have long considered military options for dealing with North Korea highly problematic because the Kim regime could immediately retaliate by unleashing waves of conventional artillery trained on the South Korean capital, causing widespread devastation. The greater Seoul area is home to 25 million people, almost all of whom are within artillery range.

Analysts said that Trump’s speech would ring alarm bells in the region.

“American rhetoric on North Korea has traditionally been quite restrained, they haven’t been trying to match the North Korean rhetoric,” said John Delury, an American professor of international relations at Yonsei University in Seoul.

“So there is a genuine concern here: is the Trump administration serious? Are they going to take us into the war we’ve avoided having since 1953?” he said, referring to the end of the Korean war.

Narushige Michishita, a Korea expert at the National Graduate Institute for Policy Studies in Tokyo, said that while the Abe government supported a hard line on North Korea, many Japanese people would also be concerned about Japan suffering during any conflict.

“The use of massive force would cause a huge amount of destruction in South Korea but Japan might also suffer,” he said.

For China, the military option was “unimaginable” and “too costly”, said Cui Zhiying, director of the Korean Peninsula Research Centre at Tongji University in Shanghai.

“War is an unimaginable option and it should not be an option at all. It would hurt all parties, everyone on the peninsula and in the Northeast Asia region,” he said.

In Russia, which has largely defended North Korea’s interests although it supported the tightened sanctions, Trump’s remarks were seen as a dangerous harbinger of instability.

Leading members of the Russian foreign policy establishment said that Trump’s statements echoed his inexperience and were potentially dangerous for US allies.

“Any military conflict means deaths of civilians. It is especially odd as the US considers South Korea and Japan its allies, and they could be affected in case of a strike,” Andrei Klimov, chairman of the foreign affairs committee in Russia’s upper house of parliament, told the Interfax news agency in an interview Tuesday.

While Russian officials were initially excited about Trump’s readiness to overturn the international order, a promised detente with Russia has failed to materialise, while bellicose rhetoric against Russian partners such as North Korea and Iran has stepped up.

At least “unlike his predecessors, he didn’t put Russia among the main threats to mankind and even praised our country for cooperating with the Security Council on North Korea,” Konstantin Kosachyov, another senior member of Russia’s upper house of parliament, wrote in a post on Facebook.

But Trump’s speech was “disappointing,” said Kosachyov, who was in New York for this week’s summit, particularly for “the extremely dangerous statements about the readiness to ‘totally destroy North Korea’ and exit the Iran deal as ‘one of the worst for the US and an embarrassment.’ Plus Syria, Cuba and Venezuela as though they were the worst dictatorships in the history of mankind.”

Additional reporting by Associated Press and Reuters