In 2013, state media cited leader Kim Jong Un as having ordered his military to prepare plans on launching strikes on US military bases in Guam, Hawaii and South Korea as well as the American mainland.
North Korea is actually capable of hitting Guam with its Hwasong-12. China is the North's biggest economic partner and source of aid, but says it alone can't compel Pyongyang to end its nuclear and missile programs.
Trump has been escalating his rhetoric against North Korea, but said he hopes "it will all work out". It also said that the two "reiterated their mutual commitment to denuclearization of the Korean Peninsula".
Officials haven't raised the USA territory's threat level even after Pyongyang laid out plans to strike near the island in the coming weeks, Guam Gov. Eddie Calvo said.
The possibility of escalation is made even more acute by the lack of any means of official communication across the Demilitarized Zone, though there has been no easing of the barrage of inflammatory comments in the USA and the North since new sanctions against North Korea were announced last week. We live on a small island. DPRK stands for North Korea's official name, the Democratic People's Republic of Korea. "As I said, they will be met with fire, fury and frankly power, the likes of which this world has never seen before".
The Asian country warned that it is preparing to fire four missiles over Japan and into the waters around Guam - where some 7,000 US military personnel reside among the island's population of 160,000 American citizens.
"Kim Jong Un's reckless behavior can not be tolerated", she said, "and I strongly urge the president to explore every avenue to peacefully respond to it and avoid further escalating this situation".
But Trump's comments did not appear to be backed by significant military mobilization on either side of the Pacific, and an important, quiet diplomatic channel remained open.
Japan's ability to destroy North Korean missiles in its airspace as they are ascending has been called into question.
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There have been no air raid drills or cars in camouflage netting as has been the case during previous crises.
The island has been the focus of North Korean threats in the past, as the home base for nuclear-equipped bombers that have the capacity to strike the reclusive nation.
The U.S. military has said it plans to increase its presence on Guam and will move thousands of U.S. Marines now stationed in Japan to the island between 2024 and 2028. The annual joint US-South Korean military exercise, called Ulchi-Freedom Guardian, is expected to proceed as scheduled starting on August 21, said Lieutenant Colonel Christopher Logan, a Pentagon spokesperson. North Korea claims the exercises are a rehearsal for war, but Washington and Seoul say they are necessary to deter North Korean aggression. "Military solutions are now fully in place, locked and loaded, should North Korea act unwisely", he wrote on Twitter. It will be carried out in a "multi-concurrent and consecutive way" upon Kim Jong-un's order.
Guam has been a US territory since 1898, when Spain ceded it in the wake of the Spanish-American War.
Naval Base Guam is an important outpost for USA fast-attack nuclear powered submarines that are a key means for gathering intelligence in the region, including off the Korean peninsula and in the South China Sea where China has been building military bases on man-made islands that have stirred tension across Asia.
Trump also brushed away calls for caution from other world leaders, including Germany's Angela Merkel.
"It's just like setting off fireworks because most of their guided missiles just crash midway through flight", she said. "Perhaps she is referring to Germany". "Nobody loves a peaceful solution better than President Trump".
"For me because I'm a father, so it's really concerning, you know, I wish it didn't have to come to that", he said.