The closer the economic ties the closer the dependency, its just the rule of the game. Such as Germany with Russians gas pipeline where even that the US have threaten to give sanction to the company involving in the pipeline regardless if the company is from Europe origin. Once the pipe is done then US will have far less influence to Germany, and they dont want that.
China is a threat, specially with how they enforcing the nine dash line thats a fact. As for military action I say NO ONE wants to see it happen, not even US or China. Why? Simply because China has succeeded balancing the economic and military power of US, war is costly and hard to sell domestically. So what they do is balancing the power in SCS by doing "freedom of navigation", placing their carrier close, "patroling", etc. In Indo word is gertak sambal while limitting the expansion and influence of China in the process.
And if you are looking for agreement between those two and I shall say it less likely to happen, it will be more like cat and mouse game. US economy is driven (one of them) by its military industry thus they need "enemy" to make their business rolling. Right now there isnt much left in Arab land so China with its SCS issue is the perfect one. China need to secure its supply line as this is the most vulnarable side, one military blocking in Malaka straight and China might be running out of supply to fire their industry and feed their billions people, hence the 9 dash line (they can get closer to Malaka straight), their lobby to create stratight out of Thailand land, overseas port around Andaman sea etc.