The China National Offshore Oil Corp and the Philippine National Oil Co have already signed an agreement for joint marine seismic exploration in certain parts of the South China Sea, a move approved by the two nations' governments. Vietnam later joined the exploration agreement.
"China's proposal of joint mineral exploitation shows its sincerity to resolve territorial issues, and the countries concerned should also show their own sincerity," Jia said.
"It is important that China and Southeast Asian countries control the risk of tensions aroused by the territorial issues," he added.
Wang also said the agreement should be reached through consultation and bilateral negotiations between the concerned parties, while gradually pushing forward the consultations on the Code of Conduct of the South China Sea.
Wang's four-country visit to Southeast Asia is a continuation of China's efforts to strengthen ties with ASEAN members. In May, Wang visited Indonesia, Thailand, Singapore and Brunei, his first official visits since being appointed foreign minister.
In late June, Wang and his ASEAN counterparts held a series of meetings in Brunei, during which they stressed the importance of good ASEAN-China relations.
Xinhua contributed to this story.
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