President Moon Jae-in begins a four-day visit to China on Wednesday, which will include a summit with his Chinese counterpart Xi Jinping on Thursday.
Washington remains frustrated that worldwide sanctions on Pyongyang have not resulted in the North halting its nuclear and long-range ballistic missile tests.
"China has already proposed "double suspension" proposal and we hope that the United States and North Korea can meet each other halfway and take meaningful steps on dialogue and contact", Lu said. While the United Nations Security Council is considering ways to refresh current sanctions against Pyongyang, a USA proposal to cut off oil supplies has been rejected by Beijing.
Russia's top general Valery Gerasimov met Japanese Defence Minister Itsunori Onodera in Tokyo and reiterated that Moscow wanted to resolve the crisis via diplomacy.
North Korea's leader Kim Jong Un vowed to develop more nuclear weapons on Tuesday while personally decorating scientists and officials who contributed to the development of Pyongyang's most advanced intercontinental ballistic missile, the Hwasong-15.
Shin Sang-jin, a professor from Kwangwoon University, said USA involvement remains the key.
China has welcomed an offer by U.S. Secretary of State Rex Tillerson to hold talks with North Korea without pre-conditions. "Discussions between the US, China and the two Koreas are necessary".
"We're ready to talk anytime North Korea would like to talk".
This year, in the 10 months to October 31, South Korea welcomed a total of 3.54 million visitors from China, representing a year-on-year fall of 49.6 percent in such trade, according to data from the Korea Tourism Organisation.
Japan's maritime Self-Defense Force did not say whether the US Terminal High Altitude Area Defense (THAAD) system would be involved in the drills, Reuters reported.
There have also been reports that refugee camps are being built along China's border with North Korea.
Moon told the state-run CCTV on Monday that Thaad was deployed to deter North Korea and does not target China. ( ) Moon Jae-in's first state visit as president of the Republic of Korea and it is to China a reflection of how important the two countries are to one another or what they risk should their ties remain at subpar levels. "I want all to cooperate over this problem".
Cheng Xiaohe, an associate professor at Beijing's Renmin University of China, said the two nations' decision to put aside the dispute over Thaad and restore bilateral ties would send a strong message to Pyongyang and Washington, further strengthened by Moon's visit.
But deep political trust can not be built in a day, experts said, pointing out that China's essential position on Thaad has not changed.
"South Korea may start the reconnaissance system affiliated with the THAAD to check whether it could work properly and collect accurate information on intercepting missiles", Yang said.