China supports Pakistan, a local rival to India. But then USA supports a lot of countries that are scared of China's rise. https://en.wikipedia.org/wiki/Territo

China supports Pakistan, a local rival to India. But then USA supports a lot of countries that are scared of China's rise. https://en.wikipedia.org/wiki/Territorial_disputes_in_the_South_China_Sea https://en.wikipedia.org/wiki/Territorial_disputes_in_the_So... USA can help India catch up at least when it comes to military and fill in any gaps with allies /US firepower should a war happen meanwhile. China cannot stop India, but India can stop India. If a war starts (not likely,) China will be virtually alone, maybe just NK joins them. At least Taiwan, Japan, South Korea have super-modern weapons and the rest of the countries can tie China's hands.