In her address at the 4th East Asia Summit Foreign Ministers' Meeting here, External Affairs Minister Sushma Swaraj said maritime territorial disputes have the potential for undermining comprehensive security and mutual confidence.
"India opposes the use or threat of use of force and supports freedom of navigation and access to resources in accordance with principles of international law, including the 1982 UN Convention on the Law of the Sea.
State-run ONGC Videsh Limited has operation in number of oil blocks in South China Sea which were offered to it by Vietnam.
China has been objecting to India's oil exploration projects in the disputed waters.
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China claims sovereignty over almost the entire South China Sea, which lies on key shipping routes and is believed to be rich in mineral and oil. But its claims clashes with ASEAN states Brunei, Malaysia, the Philippines and Vietnam, as well as Taiwan.
Talking about Thailand, she said as a friendly neighbour of Thailand, India supports ongoing dialogue and the restoration of the democratic process in that country.