On her first foreign trip since her election as Northeast Asia's first woman leader, President Park Geun-Hye is seeking both a show of unity and to keep momentum in South Korea's drive to build an outsized role in world affairs.
Park and Obama began a meeting in the Oval Office hours after North Korea's military launched its latest threat, vowing to turn border islands into a "sea of flames" if a shell fell on its side during joint US-South Korea drills.
A US defense official said that North Korea has shifted two medium-range Musudan missiles away from a launch site, signaling that -- at least for the time being -- the regime has no imminent plans to test-fire them.
China, the primary supporter of North Korea, took one of its most concrete measures to date with the state-owned Bank of China closing the account of a North Korean bank accused by Washington of supporting the nuclear program.
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"Many analysts have anticipated that the North Korean provocation cycle would culminate in some sort of a grand fireworks display, and no one can rule that out," Russel said.
"No one should be prepared to declare a victory yet," he said.
Satellite images published by US think tanks have shown that North Korea is forging ahead with its nuclear program and has almost finished construction of a light-water reactor that could provide plutonium for nuclear weapons.
The Obama administration, which grew exasperated during its first term on how to handle North Korea, is eager to give the lead to Park -- partly as a way to deflect Pyongyang's allegations that South Korea is a US puppet.
Obama will be listening to hear Park flesh out her idea, offered during the election campaign, of "trustpolitik" -- developing more stable relations between the two Koreas through respect of agreements.
Park today will address a joint meeting of Congress. Accompanied by leaders of major South Korean businesses, she will also visit the US Chamber of Commerce to mark one year after a free trade deal entered force.
Park has invited US veterans to a dinner that marks the 60th anniversary of the Korean War armistice, a gesture sure to be welcomed by Americans concerned by anti-US sentiment in South Korea in the 2000s.
The Lee-Obama friendship came as South Korea avidly sought a global role incommensurate with its size. South Korea played host to two major global summits and has witnessed a phenomenal cultural export through superstar Psy.
While welcoming South Korea's rise, the United States has also been careful not to appear to favor the country over fellow ally Japan. The two nations have a tense relationship, with many Koreans resentful over Japan's colonial rule.