Trump and North Korean leader Kim Jong-Un have exchanged increasingly bellicose rhetoric in recent days, as worldwide alarm mounts over Pyongyang's weapons ambitions - including a hint this week that the country is considering detonating an H-bomb over the Pacific.
It claimed that it had detonated a hydrogen bomb that can be mounted on an intercontinental ballistic missile.
The move was meant to send a clear message, as the bombers flew the farthest north of the demilitarized zone between North and South Korea that any US military crafts have flown in the 21st century, according to the Pentagon.
The Pentagon confirmed that it had shown off its bombers, saying that it was a response to North Korea's "reckless behaviour".
An natural disaster registered earlier Saturday in North Korea near the site of a previous nuclear test prompted a flurry of speculation that the reclusive regime had carried out another such test.
North Korea's Foreign Minister Ri Yong Ho warned on Thursday that North Korea could consider a hydrogen bomb test of an unprecedented scale over the Pacific. China at first said it suspected an explosion.
Another Korea Meteorological Administration official, who also didn't want to be named, said the agency believes it's a low probability that the quake was caused by a tunnel collapse. "So as of now, we are categorizing this as a natural quake".
South Korea and Japan are United States "stooges", and only countries that participate in USA actions against North Korea are endangered, he said. The last registered as a magnitude 6.3. Website 38 North said satellite imagery taken after that test appeared to show landslides atop the site that were more numerous and widespread than after the previous five tests.
In August, following reports from the Defense Intelligence Agency that North Korea could make nuclear warheads small enough to fit on missiles and could have as many as 60 nuclear devices, Trump issued a sharp warning to the country.
The flight came after days of increasingly bellicose rhetoric between US President Donald Trump and North Korean leader Kim Jong-Un's regime, as global alarm mounts over Pyongyang's nuclear ambitions.
Last week, US President Donald Trump told the United Nations that he would "totally destroy" North Korea if the US was forced to defend itself or its allies.
On Thurdsay, Trump announced increased economic sanctions against the impoverished and isolated country, targeting foreign companies who do business with the North.
Earlier on Saturday, China said it will limit exports of refined petroleum products from October 1 and ban exports of condensates and liquefied natural gas immediately to comply with the latest United Nations sanctions. China, responsible for about 90 percent of North Korea's trade, serves as the country's conduit to the worldwide banking system.