You might think this isn’t worth paying attention to if you’re outside the chip industry, but it is. ASML is a Dutch company most people have never heard of, but it is, by a wide margin, the most important company in the global AI buildout that isn’t named Nvidia or one of the hyperscalers. It makes the only machines on the planet capable of EUV lithography — the process of printing the microscopic circuit patterns that define the most advanced chips.

Every cutting-edge processor made by TSMC, the foundry behind Nvidia’s and Apple’s chips, depends on ASML tools that took the company roughly two decades and untold billions to develop. There is, at present, no second supplier. That monopoly has made ASML Europe’s most valuable public company, with a market capitalization that has been trading in the neighborhood of $700 billion as of this week, up sharply over the past year on the back of insatiable AI-driven chip demand.

That scale is exactly why the China question matters so much. If even one EUV machine made it into Chinese hands, it would represent one of the most consequential breaches of the export-control regime the U.S. has built over the past several years to keep advanced AI capability out of Beijing’s military and industrial base.

I sat down with ASML CEO Christophe Fouquet six weeks ago, well before this story broke, and asked him directly about the China question.