The United States and its allies in the Pacific in regards to Taiwan operate on a policy of strategic ambiguity

Which basically means they have the option to help Taiwan or to leave them to face the Dragon alone

As for Russia and China I agree with you 100% they are allies of convenience and for the Chinese they want access

The freshwater supply which is available by take control of parts of Siberia

Russian territory would resolve China's water security issue which according to the United Nations China is one of the 13 countries

On our planet which has terrible water security