Geng said both bilateral and global issues would be taken up during the dialogue, which will be led on the US side by Secretary of State Rex Tillerson and Defense Secretary Jim Mattis.
Oh Kyung-seop, a researcher with South Korea's Korea Institute for National Unification, said Wednesday as many as 80,000 North Koreans work in low-wage jobs in Chinese industries that benefit from cheap labor, Yonhap reported.
The US will use a high-level security dialogue with China on Wednesday to make Beijing aware of Washington's concerns about almost 10 Chinese companies and individuals allegedly having links to North Korea's missile and nuclear programme, a senior US diplomat confirmed.
Trump has had high hopes for cooperation from China to exert influence over North Korea, leaning heavily on Chinese President Xi Jinping for his assistance.
Mattis vowed to "continue to take necessary measures to defend ourselves and our allies" against North Korea, which is working to develop a nuclear-tipped missile capable of hitting the United States.More news: Citing strong job market, Fed votes to boost rates
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The Chinese spokesperson said that in recent years "China has stepped up its efforts to promote peace talks" on the Korean peninsula.
"While I greatly appreciate the efforts of President Xi & China to help with North Korea, it has not worked out", he wrote, referring to his apparently failed attempts to persuade the Chinese government to contain the totalitarian regime, with whom China shares a 880 mile-long stretch of border.
China's top diplomat told Donald Trump that Beijing was willing to keep working with Washington to defuse tensions on the Korean peninsula - days after the U.S. leader implied that Chinese efforts had failed. "At least I know China tried!".
The talks will take place against the backdrop of Otto Warmbier's death, a US citizen held captive in North Korea who passed away on Monday just days after returning home.
Susan Thornton, the senior US diplomat for East Asia, said North Korea would get "top billing".
Geng said tensions in the South China Sea have cooled amid efforts by China and the 10-member Association of Southeast Asian Nations to cement a code of conduct that would ostensibly help them avoid conflicts.
- Prisoner in a coma -Last week, what initially seemed a gesture of goodwill by Pyongyang - the release of a detained USA tourist - turned sour when it was revealed that 22-year-old Otto Warmbier had been brain damaged and in a coma for some time.