Two years ago, almost no one outside of North Korea-watching circles had heard of him.
China is the largest trading partner, economic benefactor and political supporter of North Korea.
Crippled by shortages of electricity, only about a third of North Korea's factories are running.
At high tide on the Yalu, you can almost get within arm's reach of North Korea.
Obviously the issue of North Korea will be one among a number of topics that we discuss.
WHITEHOUSE: President Obama and President Lee Hold a News Conference
Not to engage now would be to deny themselves any influence over the future of North Korea.
We discussed regional security, and that obviously includes the issue of North Korea.
WHITEHOUSE: President Obama and President Lee Hold a News Conference
They said most of North Korea's delegates, including chief negotiator Kim Kye Gwan, have been in their roles for decades.
The publication of Mr Perry's report has been delayed for months as America awaited a signal of North Korea's intentions.
Some officials say they do not see any sign of North Korea testing the missiles within the next two months.
And we will also work to ensure the denuclearization of North Korea.
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White House spokesman Jay Carney said the decision to reopen the Yongbyon reactor was "another indication" of North Korea "violating its international obligations".
BBC: North Korea 'crisis gone too far' says UN's Ban Ki-moon
Now these are measures which have been issues before, in the context for example of North Korea, and they have had an effect.
"We do not rule out the possibility of North Korea being involved, but it's premature to say so, " Defence Ministry spokesman Kim Min-seok said.
The United States believes the missiles remain at a point about half way down the eastern coast of North Korea and about 10 miles inland.
"They have to take some actions, " Kerry said of North Korea.
In Singapore Robert Gates, America's defence secretary, met his Japanese and South Korean counterparts, to reassure them in the face of North Korea's nuclear bluster.
Speaking during a visit to Germany, Russian President Vladimir Putin said that as a neighbour of North Korea his country was "worried about the escalation" of tensions.
The two candidates pursued their themes of experience versus vision in skirmishes over the conflict between Russia and Georgia and the question of North Korea's nuclear program.
But others appear not to welcome this position, including Wu Dawei, the senior Chinese official involved in talks aimed at getting rid of North Korea's nuclear weapons.
Mr. Kerry, on visits to Seoul, Beijing and Tokyo, quizzed Asian diplomats and defense officials on the strategy of Mr. Kim and the inner-workings of North Korea's government.
The project has also attracted Andrei Lankov, a Seoul-based historian of North Korea who grew up in the Soviet Union and went to college in Pyongyang, the North Korean capital.
WSJ: Gulags, Nukes and a Water Slide: Citizen Spies Lift North Korea's Veil
The threats against the U.S. are also hard to take seriously because hitting long-range targets is still widely believed to be beyond the current limits of North Korea's missile technology.
Yet as Marcus Noland, a scholar of North Korea at the Peterson Institute for International Economics, argues, Mrs Clinton is constrained by the need for Chinese support on many issues.
ECONOMIST: Tensions rise over efforts to create a new Chinese lake
U.S. officials said the goal of the flight wasn't to ratchet up tensions, but over time, to bring them down by showing strength in the face of North Korea's actions.
The six-party process -- including the nations of North Korea, South Korea, the United States, Russia, China and Japan -- is the diplomatic effort to address North Korea's nuclear program.
CNN: Clinton slams N. Korea's rhetoric, 'belligerent' actions
Amid an administration review of North Korea, Clinton also spoke to the foreign ministers of Japan, South Korea, China and Australia -- key allies working to disarm Pyongyang, the spokesman said.
The United States, North Korea, China, Japan, Russia and South Korea are involved in nuclear agreements made earlier in the year that will lead to the disabling of North Korea's nuclear facilities.
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