South Korea’s newly elected president vowed on Wednesday to play a more assertive role in resolving North Korea’s nuclear crisis through dialogue, saying that he was willing to meet with its leader, Kim Jong Un, if the circumstances were right.

President Moon Jae-in also pledged to strengthen the alliance with Washington, expressing an eagerness for an early summit meeting with U.S. President Donald Trump, whose military posturing and diplomatic overtures toward the North in recent weeks have both rattled and confused South Koreans.

But Moon also hinted at balancing diplomacy between the United States and China, his country’s largest trading partner, over the contentious deployment of a U.S. missile defence system in South Korea.

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Trump called Moon hours after he was formally sworn in on Wednesday. The two leaders agreed to maintain a strong alliance and co-operate in dealing with North Korea’s nuclear and missile threats, Moon’s office said. They also agreed to hold a summit meeting in Washington at the earliest opportunity, it said.

Moon Jae-in declared victory in South Korea?s presidential election May 9, 2017 after his two main rivals conceded, capping one of the most turbulent political stretches in the nation?s recent history.

“The alliance with the United States is and will always be the foundation of our diplomacy and national security,” Moon was quoted as telling Trump. “The alliance is more important than ever, given the rising uncertainty surrounding the Korean Peninsula.”

Moon’s comments appeared aimed at easing fears that his new liberal government and its eagerness for diplomatic and economic engagement with North Korea may create a rift with Washington.

Compared with his two conservative predecessors, who had stressed a united front with Washington in punishing the North, Moon has often called for his country to take the lead in easing tensions on the divided peninsula through dialogue.

“I will do whatever it takes to help settle peace on the Korean Peninsula,” Moon said during a speech at the National Assembly, where he was formally sworn in on Wednesday. “If necessary, I will fly immediately to Washington.”

A day after winning the presidential election, Moon took office by reconfirming the broad changes he promised during his campaign, including curtailing the powers of the presidency and eliminating corrupt ties between government and business.

He also vowed to “get busy for the sake of peace on the Korean Peninsula.” Moon said he was also willing to travel to Pyongyang, the capital of North Korea, to meet its leader, Kim. But he cautioned that for such a trip to take place, “the circumstances have to be right.” He had earlier said that dialogue would become difficult if the North raised tensions with another nuclear test.

The last inter-Korean summit meeting was in 2007, between Kim’s father, Kim Jong Il, and the president of South Korea at the time, Roh Moo-hyun, Moon’s closest friend and ideological ally.

Moon is widely expected to introduce a modified version of Roh’s so-called sunshine policy of engaging North Korea with dialogue, humanitarian aid and joint economic projects.

The idea behind the sunshine policy was to build trust with the North so that it would negotiate away its nuclear and ballistic missile programs. But that policy was thrown out in the past nine years. The two last presidents in Seoul, both conservatives, joined hands with Washington to try to isolate Pyongyang with sanctions and pressure, as the North advanced its weapons programs by conducting a series of nuclear and missile tests.

Moon’s election signalled the return of the liberals to the centre stage of South Korean diplomacy. They believe that sanctions alone have failed to persuade North Korea to give up its nuclear weapons programs. They also do not want South Korea to be dragged into a hegemonic struggle between the United States and China — an attitude exemplified by their ambiguous stance over the deployment in South Korea of a U.S. anti-missile battery, the Terminal High Altitude Area Defense system, known as THAAD.

THAAD went operational last week, despite angry protests from China, which said that THAAD’s powerful radar undermined its own security. Chinese consumers have begun a boycott of many South Korean brands. Many South Koreans fumed over the economic retaliation by China, considering it the price of protecting the alliance with Washington. But others accused the United States of foisting the weapon on their country, especially after Trump said that Seoul should pay $1 billion (U.S.) for the THAAD battery, contrary to an earlier agreement.

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During his campaign, Moon said he would review the deployment, a stance he reaffirmed as president.

“I will engage in sincere negotiations with the United States and China to find a solution to the THAAD problem,” he said.

Moon’s victory on Tuesday capped months of political turmoil marked by the impeachment, ouster and arrest on corruption charges of his predecessor, Park Geun-hye. The country has been led by an acting president since Park was removed on March 10 and Moon took office without a customary two-month transition.

In his first day in office, Moon rushed to build his government, appointing Lee Nak-yon, a provincial governor, as his prime minister.

He also selected Suh Hoon, a former intelligence official, as director of the National Intelligence Service.

Suh has spent his career monitoring North Korea and was involved in the negotiations that resulted in the two summit meetings between the two Koreas, the first in 2002 and the second in 2007. Moon said he expected Suh to play a role in resolving the North Korean nuclear crisis.

On Wednesday, Suh said that another inter-Korean summit meeting was “necessary” but that it would be premature to discuss it when military tensions remained high on the peninsula.

“What we need the most is to find a breakthrough for resolving the North Korean nuclear issue,” Suh said. “When such conditions mature, I think we can go to Pyongyang.”

Moon’s is the first liberal government in South Korea in nearly a decade. Conservatives remained disgraced by Park’s downfall but deeply wary of Moon’s approach to the North, which they said could jeopardize the alliance with Washington.

Moon’s inaugural speech appeared to have been worded to ease such concerns while also putting a progressive stamp on foreign policy.

In the address, Moon emphasized “national unity” with his political opponents and vowed to make his government more transparent.

He said he would not take up residence in the Blue House, a symbol of what South Koreans call the “imperial presidency,” and instead work from a government building in the bustling centre of Seoul to make his office more accessible to the people.

“I will become a clean president,” said Moon, referring to a succession of South Korean leaders, including Park, who have ended their presidency in disgrace because of corruption scandals. “I will become a president who can retire home as an ordinary citizen and is welcomed by neighbours.”

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