Although Wang stopped short of mentioning the United States, he said "certain major countries outside the region" had attempted to replace unity with division while seeking geographical gains, the ministry said in a statement.
"If this trend is allowed to develop, it will not only seriously interfere with the smooth progress of trilateral cooperation, but also increase tension and confrontation in the region," Wang added.
Wang emphasised the need to solve disputes through dialogue and consultation, and oppose words or deeds that could plunge the region into war, according to Channel News Asia.