Many countries have tried to ally with the USA because they feel that in time of war, our power could protect them. Whenever there is a threat, they cling to the more powerful countries. Some countries are fearful of China. Many of them are forming closer ties to the USA in case China decides to flex its muscles. But if these same countries feel at any point that we could not protect them, would they do a 360 and try and form closer ties with China instead? It would make sense. If you can't beat them, join them.