White House Deputy Chief of Staff Joe Hagin, the puppeteer pulling the strings on the U.S. Senate must save itself by confirming Mike Pompeo Poll: Menendez has 17-point lead over GOP challenger MORE (D-N.J.) said that while the weapons program is a priority, an ideal agreement would also cover North Korea's human rights abuses.
"We feel like things are continuing to move forward, and good progress has been made".
Kim is said to have spent the night at the North's Embassy in Beijing and will fly back to North Korea on Monday.
Trump on Friday revived the summit after cancelling it a week earlier.
And in the "Frunze Academy Affair", elite young officers who had been studying at Moscow's Frunze Academy, and were recalled home after the death of first-generation dictator Kim Il-sung, are believed to have plotted a regime overthrow.
"All these (promoted) guys are top Kim Jong Un guys", said Michael Madden, author of the highly respected North Korea Leadership Watch blog.
The country's top three military officials have been replaced with younger, more "moderate" figures who have more "flexibility in thinking" than their predecessors, according to an unnamed intelligence source quoted in the South Korean media.
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Both countries have faced worldwide isolation, North Korea over its nuclear weapons program, and Syria over its tactics during a bloody civil war.
But it is the meeting in Singapore on 12 June with President Trump that is the most high-profile and which has the most at stake, with the USA demanding the full denuclearisation of the Korean peninsula and the North seeking to ease crippling sanctions.
The historic meeting between Mr Trump and Kim would be the first between sitting U.S. and North Korean leaders.
They added that the GPB could be influential enough to resist leadership policy decisions and try to profit from future South Korean economic aid.
In just eight days' time, the eyes of the world will be on Singapore.
"(Kim) is not going to want these military commissars helping themselves to any of this assistance coming to the North", Madden said.
They also insist in the letter that North Korea commit to "robust compliance inspections" that "including "anywhere, anytime" inspections" of both declared and non-declared "suspicious sites".