It's unsustainable. Trump's broader trade policy is protectionist. But the reason his China policy finds firmer footing than e.g. his Mexico tariffs come from China's abuse of several good-faith measures over the past 30 years (e.g. early accession to the WTO). It was plausible to assume the next leader would be another Deng. But when Xi ensconced himself as a "leader for life" [1], the timing calculus changed.