China is the bully here. Just see what they are doing at the borders with India at Galwan Valley! I don't see how you can come to that conclusion! US is doing the right thing!
China has illegally extended its maritime boundaries to include boundaries of other ASEAN countries (read up on UNCLOS: [2] and what is considered International Waters and what is not. It even lost a legal battle with Philippines [3] but still continues to illegally expand its maritime boundaries). It can lead to blockade of essential goods and services including oil and gas to Japan and South Korea. US doesn't claim any of those lands or sea except for the base where it has military presence. All major powers in the World have military bases spread across the globe. None of them are considered "expansionist". Many of those bases are setup either through an agreement with the Country in possession of the land or by leasing it. The bases can be removed at any time. But China is claiming territory. Both are totally different! So yes I stand by my point: China is the bully here!
It is doing the same in India as well. Expansion. Please don't compare the two again!
[2]: https://www.un.org/depts/los/convention_agreements/texts/unc...
[3]: https://qz.com/733012/it-is-beijings-fault-that-china-lost-b...