Moon's softer stance on North Korea could create friction with Washington, which has swung from threats of military action to hints of dialogue as it seeks to formulate a policy under President Donald Trump.
South Korea's first liberal leader in a decade, Moon also said he'll "sincerely negotiate" with the United States, Seoul's top ally, and China, South Korea's top trading partner, over the contentious deployment of an advanced US missile-defense system in southern South Korea. The system has angered Beijing, which says its powerful radars allow Washington to spy on its own military operations.
"I will quickly move to solve the crisis in national security. I am willing to go anywhere for the peace of the Korean Peninsula if needed, I will fly immediately to Washington. I will go to Beijing and I will go to Tokyo. If the conditions shape up, I will go to Pyongyang," Moon said.
Moon assumed presidential duties early in the morning after the National Election Commission finished counting yesterday's votes and declared him winner of the special election necessitated by the ousting of conservative Park Geun-hye, whose downfall and jailing on corruption charges is one of the most turbulent stretches in the nation's recent political history.
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The nomination of Lee Nak-yon as prime minister was seen as an attempt to get more support from the southwestern liberal stronghold where Lee had served as governor and lawmaker.
Lawmakers must approve Lee for the country's No. 2 job, which was largely a ceremonial post before Park's removal made current Prime Minister Hwang Kyo-ahn a government caretaker.
Talking to reporters, Suh endorsed Moon's call for a summit meeting with North Korean ruler Kim Jong Un, although saying it would be difficult for such a meeting to take place soon, considering the tension over the North's nuclear programme.
"The talk about a South-North summit is a little premature, but regardless of that, there's a need for a summit meeting," Suh said. "If conditions ripen and provide opportunities to significantly lower military tension in the Korean Peninsula and open a path toward solving the North Korean nuclear problem, which is the most urgent threat to our security, then I think (Moon) will be able to go to Pyongyang."
Moon also offered a message of unity to his political rivals Moon's Democratic Party has only 120 out of 300 seats in the National Assembly, so he may need broader support while pushing his key policies.
"Politics were turbulent (in the past several months), but our people showed greatness," Moon said.