Mr Obama and Mr Medvedev met during a nuclear summit in the South Korean capital Seoul.
In Seoul, Beijing and Tokyo, Mr. Kerry probed foreign leaders for clues to Mr. Kim's strategy.
Seoul-based North Korea expert Han Byung Hoon says Kim Jong Il faces three tasks.
Hong Jae Chul, president of the Seoul-based Christian Council of Korea, an alliance of conservative churches.
Last year, just over 1, 500 arrived in South Korea, according to the government in Seoul.
The Yonhap news agency provided the same information, citing a Foreign Ministry official in Seoul.
Seoul's air, once famously noxious, is much improved, but South Korea lags at conservation.
Seoul made a new offer of talks over the facility to Pyongyang on Thursday.
Goldman Sachs, an American investment bank, has more women than men in its office in Seoul.
The Secretary-General, accompanied by Madam Ban, returned to New York from Seoul that evening.
Managing it without loosening Washington's alliance with Seoul would require statesmanship of the highest order.
Automakers and heavyweight tech companies advanced in Seoul, with the yen's rebound providing relief.
About 60 registered SAT prep centers operate in Seoul alone, according to the metropolitan education office.
WSJ: SAT Scandal Shines Harsh Light on South Korean Academics
In April last year, Seoul sent its first astronaut into space aboard a Russian Soyuz rocket.
Now of course the G-20 in Seoul is sure to be a glorified photo-op.
We were speaking in Seoul shortly after the Kaesong industrial park had been shut down.
Singapore Changi Airport took the No. 1 spot, followed by Incheon International Airport in Seoul.
Pyongyang said recently it would scrap the Korean war armistice and end non-aggression pacts with Seoul.
It says it has scrapped the Korean War armistice and ended non-aggression pacts with Seoul.
BBC: News - South Korea, US sign military plan against North 'provocations'
It was 1987 and South Korea was preparing to host the Olympic Games in Seoul.
With direct flights from Japan, Seoul, Hong Kong and Singapore, it's also highly accessible.
CNN: ASIANOW - TIME Asia | Travel Watch | Open the Door to Cool Summer a Escape
In Seoul, the Kospi index settled 0.66 percent higher to close at 1912.
North Korea's escalating belligerence points to the need for Tokyo and Seoul to increase cooperation.
Seoul and the US had warned of a "swift and strong response" to any military provocation.
BBC: North Korea 'crisis gone too far' says UN's Ban Ki-moon
Following the trip to the Middle East, Mr Kerry will travel to Seoul, Beijing and Tokyo.
While the rhetoric coming out of the meetings in Seoul sounds positive, nothing concrete was agreed.
They will win, but the price - especially for Seoul -- will be prohibitively high.
Seoul's Defense Minister Kim Kwan-jin said Monday he still believes the missile would be fired soon.
The North has also shut down an emergency military hotline between Seoul and Pyongyang.
The guilds were located in major cities throughout Korea including Seoul, Busan, and Daejeon.
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