in the S china sea , generally speaking Vietnam / Phillipines / Brunei tries to form a alliance against China, however Taiwan / Singapore is more or less pro PRC claim and those other SE asian state not directly in touch with the sea (like Laos / Cambodia / Burma ) are also likely to be pro China, or at least neutrual
China's border conflict with India is relatively minor, it's over some insanely uninhabitable mountains a few miles either way, the stake is not really the same, and beside it's unrealistic for a serious war to be raged in that sort of terrain anyway.