Recent moves by Microsoft and the Chinese government marked a new stage in the years-long process of tech decoupling, a SIGnal preoccupation. Meanwhile, the US and China are moving toward what might be significant high-level talks — and the US bull market continues, fueled by AI valuations that are dependent on American dominance of the AI future. None of these three elements seem at all stable. Even tech decoupling could be upended if US President Donald Trump decides to favor a megadeal that would bring Chinese investment into the US. The markets and the politics are both frothy indeed. SIG’s view has long been that AI technology as such will transform industrial processes and much else. A related but quite separate question is whether the massive investment into data centers, understood as the infrastructure of AI, is really necessary for the AI future. “Infrastructure” has a reassuringly solid sound, but if the much-anticipated burst of the AI bubble occurs then data-center capex is where the deflating is most likely to happen.
Microsoft’s withdrawal from China received less attention than it deserved. Bill Gates and his company have long been more pro-China than most of Big Tech. Microsoft’s China labs were crucial to China’s acquisition of AI expertise and experience. That is much of why China’s leader Xi Jinping mischievously greeted Gates as an “old friend” in Beijing in 2023, seven years into a bipartisan consensus that China was the pacing challenge for American security and the US economy. Microsoft’s withdrawal began late in 2024 and has continued through this year. The shuttering of its Shanghai AI lab early in 2025 was done very quietly but it reversed decades of company policy that had done much to create China’s AI industry in the first place. In short, when Microsoft decouples it really means something.
At the same time, China made a strategic shift this month with comprehensive restrictions placed on Chinese companies to prevent use of US silicon chips. This hit Nvidia particularly hard. Its share of the China market plummeted from 95% not long ago to 50%. Nvidia’s CEO, Jensen Huang, has done everything he can to hold on to what he still has. He is said to have the ear of President Trump. But the reprieve Huang secured in July seems to have been eliminated by China’s new moves. When China decouples at this scale, it really means something.
Tech decoupling is a secular trend. It is the central force behind the current trade tensions, which both China and the US have been escalating, each placing the blame on the other. President Trump’s retaliatory tariffs, set to take effect November 1, responded to China’s weaponizing (not for the first time) of its tight grip on rare-earths production. All these moves revolve around the perceived centrality of AI to victory or defeat in the geoeconomic struggle between China and the US.
The two countries are nonetheless continuing talks. China hawks in Washington and elsewhere are genuinely worried that President Trump’s love of the grand gesture will combine with the influence of Jensen Huang and others to undermine the structure of tech containment built up in recent years. They might well look to Trump adviser Peter Navarro for reassurance. He has been ringing the bell about the China threat for 20 years. And indeed at the Council on Foreign Relations on Friday Navarro spoke of how the president’s tariff negotiations have already resulted in “19 trillion dollars” of promised investment: “foreigners are going to be paying to fix the vulnerabilities in our supply chain,” and once they have done so there will be a global “level playing field.” He also said that the US pre-Trump had “shipped 19 trillion dollars of our wealth” overseas. Nineteen trillion out, 19 trillion back in, and balance is restored. That is the idea. Navarro believed China’s new rare-earths policy is showing the world that China is everyone’s enemy: “The world will not go back to sleep on this.”
But if a three-year bull market, grounded in speculative bets on building data centers to set the infrastructural stage for future AI-driven productivity gains, wobbles enough, trade wars with China could lose their appeal. Tech containment and tech decoupling, though, will continue.