The future of the US alliance system in the Asia Pacific region

What is the future of the US alliance system in the Asia Pacific region? Order Description Within the context of why there is no NATO in Asia and Hub and Spokes: The future of it, please ensure you include main debates on US alliances in Asia Pacific and include: 1. main topics (4-5) 2. main threats 3. main behaviours of states in the region or responses to the threats