But of course the North Korean people have seen their share of fire and fury at the hands of the U.S military.
North Korea carried out two tests of intercontinental ballistic missiles last month.
Still, the mere threat of striking Guam with missiles perhaps loaded with a miniature nuclear warhead goes beyond all reason and must be abandoned immediately by the leadership of North Korea.
He said this: "North Korea had best not make any more threats to the United States". But Mattis said Thursday that the American effort was "diplomatically led".
"That back channel can lead to a formal agreement that will resolve this crisis", said Perry, who in the waning days of the Clinton administration almost secured a missile agreement with North Korea.
"It's somewhat reminiscent to me of the history of World War I and how the world kind of blundered into that", Clapper said in an interview with CNN.
I suppose dying is something we all have to do eventually, but I'm talking about a kind of dying that comes on more quickly and unnaturally than we generally expect.
Now is the time for statesmanship and cool-headed diplomacy on all sides.
But hope hasn't gotten me far lately, so I figure we should prepare for the worst.
Clapper said the U.S. and North Korea could "blunder" into global military conflict as they exchange escalating hostilities.
After the telephones talks on Saturday, the White House said in a statement that the two leaders discussed the increasingly risky situation associated with North Korea's destabilizing and escalatory behavior.
The statement added that Trump had "reassured" Guam Governor Eddie Calvo that the U.S. military would "ensure the safety and security of the people of Guam, along with the rest of America".
Savage, the author of the best-selling "Trump's War: His Battle for America", noted Kim's threats are more than just talk, "he's actually been firing missiles".
The Chinese foreign ministry said Xi urged Trump to avoid "words and deeds" that would "exacerbate" the already-tense situation and to exercise restraint and seek a political settlement.
Xi Jinping, the leader of North Korea's key ally China, urged Trump on Saturday to avoid rhetoric that could inflame tensions, after the USA leader ramped up his warnings to Pyongyang, saying the Stalinist regime would "truly regret" taking hostile action against the United States. But China says it alone can not compel Pyongyang to change course.