Newly elected South Korean President Moon Jae-in chose to send special envoys to China, Russia, Japan and the United States, the presidential office said Thursday.
Beijing has said the system would spy on its territory.
What impact will S Korea's expanded missile defence system have? He also said he was prepared to go to Pyongyang "if the conditions are right". Conservative critics have anxious Moon's rise to power might cause a friction with Trump, who wants to increase pressure on North Korea with the help of China, the North's largest trading partner and aid benefactor.
U.S. President Donald Trump, who spoke with Moon on Wednesday, this month opened the door to meeting North Korea's Kim Jong-un, saying he would be honoured to meet Kim under the right circumstances.
The Japanese and South Korean leaders agreed to meet with each other as soon as possible.
"Over the past 20 years, we have tried all kinds of engagement with North Korea, including the Kaesong Industrial Complex", Kim, the expert from the Asan Institute for Policy Studies, said.
During his call with Japanese Prime Minster Shinzo Abe, the two leaders agreed that their countries must not let their hard history hamper co-operation in dealing with North Korea's nuclear programme, Moon's office said.
According to Zhao, China's understanding on how to deal with North Korea is very much in line with the new South Korean president.
Moon wants to increase dialogue and engagement with North Korea while also maintaining pressure and sanctions to encourage change.
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"Moon will be different from previous progressive leaders who focused on the ideology of the "one nation" identity", Hyun-Wook Kim, a professor at the Korea National Diplomatic Academy in Seoul, told Sputnik.
China has been upset by the Terminal High-Altitude Area Defense system that was approved by Moon's conservative predecessor as a hedge against North Korea, placing Seoul in a hard spot between its closest military ally in Washington and its largest trading partner in Beijing.
China sees the deployment of the Terminal High Altitude Area Defense (THAAD) system as a threat to its own military capability and has slapped a series of measures against South Korean businesses seen as economic retaliation.
He told Xi the ultimate goal of sanctions was to persuade North Korea to engage in dialogue about abolishing its nuclear program.
Moon also said the two countries should "wisely resolve history-related issues", the official added.
In his first discussion with the new South Korean leader, Chinese President Xi Jinping asserted that he doesn't want South Korea to deploy a US missile system, according to the BBC. While Moon may try to soothe Chinese anger over the missile-defense system, many observers say it appears too late to call for its withdrawal, which would greatly undermine South Korea's relationship with Washington.
"This is in the common interest of China and South Korea as well as overall peace and stability in the region", Xi said, according to the statement.
Chinese leader Xi Jinping called Moon Thursday to congratulate him on his electoral victory.
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