Chinese Foreign Minister Wang Yi made the statement in Manila where he hailed the "strong momentum" in improving ties with the Philippines, a longstanding American ally which has moved closer to China under President Rodrigo Duterte.
Wang's visit came a week before he was set to return to Manila for a meeting of foreign ministers from the 10-member Association of Southeast Asian Nations (ASEAN) and its partners, which include China and the United States.
"If there are still some non-regional forces or forces in the region that don't want to see stability in the South China Sea and they still want to stir up trouble in the South China Sea, we need to stand together and say no to them together," Wang told reporters.
China claims nearly all of the strategically vital sea, even waters approaching the coasts of its neighbours. ASEAN members the Philippines, Vietnam, Malaysia and Brunei, as well as Taiwan, claim parts of the sea.
Washington has repeatedly sent warships close to Chinese-occupied islands in the sea in recent years, triggering angry responses from Beijing.
Duterte, a self-described socialist, has loosened his nation's 70-year-old alliance with the United States while looking to build stronger relations with China and Russia.
Duterte has downplayed the Philippines' dispute with China, declining to use a favourable ruling from a UN-backed tribunal last year on the issue to pressure Beijing.
He has said better relations with China, following six years of tension under his predecessor who took a hard line with Beijing over the dispute, will generate billions of dollars in promised Chinese investments and aid.
Wang on Tuesday pledged 20 million renminbi ($3 million) to help rehabilitate the war-torn southern Philippine city of Marawi, where a US-backed military offensive is seeking to flush out pro-Islamic State group militants.
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