"North Korea Confidential", a book authored by Reuters correspondent James Pearson and Economist writer Daniel Tudor, is based on interviews with defectors, diplomats, and merchants and describes a society with an evolving capitalist system where money can buy power and influence.
He said the country and its US ally will also discuss the possible deployment of what he called the "most powerful U.S tactical assets" to South Korea.
The South Korean statement on the call mentions that Trump and Moon "reaffirmed their view that it was important to have North Korea come out to the dialogue table to peacefully resolve the North Korean nuclear issue by applying maximum sanctions and pressure on the North".
North Korea sharply raised regional tension this week with the launch of its Hwasong-12 intermediate-range ballistic missile that flew over Japan and landed in the Pacific.
It also objected to the translated title of the South Korean edition as "Capitalist People's Republic of Korea" and the book's cover that replaced the red star in North Korea's official seal with the US dollar mark.
Under third-generation leader Kim, North Korea has been pursuing a nuclear device small and light enough to fit on a long-range ballistic missile, without affecting its range and making it capable of surviving re-entry into the Earth's atmosphere. "That scale is to the level where anyone can say (it was) a hydrogen bomb test". "The city air raid sirens started going off".
The US now has around 28,500 soldiers stationed in South Korea, and Washington also guarantees the country's protection under its nuclear umbrella.
Earthquakes triggered by North Korean nuclear tests have gradually increased in magnitude since Pyongyang's first test in 2006, indicating the isolated country is steadily improving the destructive power of its nuclear technology.
Macron, Merkel Demand Tighter EU Sanctions Against N Korea After Nuclear Test
Schulz has called Merkel "aloof" and attacked her on a range of issues but failed to dent her lead. Merkel has been chancellor since 2005 and is widely seen as Europe's most influential politician.
"This test is just another step towards such a goal".
Hours before the test, North Korea's state news agency KCNA had released pictures showing Kim Jong Un inspecting a silver-coloured, hourglass-shaped warhead during a visit to the country's nuclear weapons institute, accompanied by scientists.
Juche is North Korea's homegrown ideology of self-reliance that is a mix of Marxism and extreme nationalism preached by state founder Kim Il Sung, the current leader's grandfather.
The admiral commended the professionalism of South Korean air force personnel involved in an August 30 training mission that included live-fire weapons drops on the Pilsung Range by South Korean F-15K's, U.S. Air Force B-1B strategic bombers, and U.S. Marine Corps F-35B fifth-generation fighters, Gesecki said.
Many analysts are skeptical diplomacy can persuade Pyongyang to give up its missiles and nuclear bombs.
North Korea escalated regional tensions once again this week by firing a ballistic missile over Japan in defiance of United Nations resolutions and fresh sanctions imposed last month which are expected to slash its export revenues by a third. The two countries technically remain at war since a truce agreed to end the 1950-1953 Korean War was never followed by a peace agreement.
The idea of potentially withdrawing seems to have been prompted by the breakdown in negotiations between South Korean officials and the United States trade representative, Robert Lighthizer, an American official with knowledge of the situation said.