Traditional analysis of tariffs in a partial equilibrium setting can tell us much about the welfare consequences of the US-China trade war. As tariffs ratchet up, welfare costs for both sides increase disproportionately. The cost of trade diversion in the US to less-efficient suppliers likely overwhelms any terms-of-trade gain the US might enjoy. In all cases, exporters in the rest of the world benefit.
Read this paper here on Vox, the CEPR Policy Portal.