Spiking nuclear tensions between the United States and North Korea showed little sign of abating Sunday as Russia warned of a "very unpredictable nosedive" if Washington does not ease up on its fiery war of words with Pyongyang.

US bombers and fighter escorts flew off the coast of North Korea on Saturday and US President Donald Trump took to Twitter with verbal threats as the brinkmanship with Pyongyang intensified.

"Just heard Foreign Minister of North Korea speak at U.N. If he echoes thoughts of Little Rocket Man, they won't be around much longer!", Trump wrote.

The bellicose rhetoric comes as international alarm mounts over Pyongyang's weapons ambitions -- including a suggestion last week that the country is considering detonating an H-bomb over the Pacific.

Russian Foreign Minister Sergei Lavrov cautioned that a softer touch was needed to defuse the crisis.

Only "caresses, suggestion and persuasion" will work, Lavrov told Russia's NTV television in an interview that aired Sunday.

If the US does not ease up, he said, "we could drop into a very unpredictable nosedive and tens if not hundreds of thousands of innocent citizens of South Korea but also North Korea, of course, and Japan will suffer -- and Russia and China are nearby."

Despite the heated exchanges, Lavrov said the United States would not take military action against North Korea because "they know for sure that it has nuclear bombs."

"I'm not defending North Korea. I'm just saying that almost everyone agrees with such an analysis," he said.

- Insult for insult -

Matching insult for insult, Trump and Korean leader Kim Jong-un have taken the standoff into bitter personal territory.

Trump used his maiden speech at the United Nations General Assembly on Tuesday to warn that Washington would "totally destroy" the North if America or its allies were threatened.

Pyongyang, which says it needs nuclear weapons to protect itself against the threat of a US invasion, responded on Friday with a rare personal rebuke from Kim, who called Trump "mentally deranged" and threatened the "highest level of hardline countermeasure in history."

North Korean Foreign Minister Ri Yong-ho took things further. He, too, dismissed Trump as deranged, and said the US president's threats had increased the chances of military confrontation.

Ri told the UN General Assembly in New York that Trump's vow to destroy his country had made "our rockets' visit to the entire US mainland all the more inevitable."

On the fringes of the UN meeting last week, Ri upped the tensions further, telling reporters Pyongyang might now consider detonating a hydrogen bomb outside its territory.

Monitoring groups estimate that a nuclear test conducted in North Korea earlier this month had a yield of 250 kilotons, which is 16 times the size of the US bomb that destroyed Hiroshima in 1945.

- Show of force -

In a show of force, US B-1 bombers took off from the Pacific territory of Guam and flew over international waters off the east coast of North Korea, accompanied by F-15C fighters based in Okinawa, Japan.

US bombers have carried out similar flights before, but the Pentagon stressed this was the furthest north of the Demilitarized Zone (DMZ) between the two Koreas that any US fighter or bomber has flown off North Korea's coast in this century.

"This mission is a demonstration of US resolve and a clear message that the president has many military options to defeat any threat," Pentagon spokeswoman Dana White said.

"We are prepared to use the full range of military capabilities to defend the US homeland and our allies."

Washington announced tougher restrictions Friday aimed at curbing North Korea's nuclear and ballistic missile program, building on tough new UN sanctions aimed at choking Pyongyang of cash.

US Treasury Secretary Steve Mnuchin said the executive order "gives the Treasury more authorities than we've ever had before."

"The president is very committed to blocking economic transactions and that's what this is all about," he said on CNN's "State of the Union" show.

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Kim's words find rapt audience in Pyongyang
Pyongyang (AFP) Sept 22, 2017
An expectant hush fell on the crowd as the giant screen outside Pyongyang's main train station went black on Friday afternoon. Workers, students in grey uniforms, travelling families surrounded by piles of bags, women shielding themselves from the late summer sun with frilly parasols, for several minutes they all gazed at the rectangle with anticipation. White text appeared on a red back ... read more

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