ASML's chief executive has warned that blocking China from advanced chipmaking tools could backfire, ultimately strengthening Huawei and other Chinese rivals rather than containing them.

The warning from the head of the Dutch lithography equipment maker cuts against the logic now driving export policy in Washington, The Hague and allied capitals. Successive rounds of restrictions have already curtailed ASML's ability to ship its most advanced immersion lithography systems to Chinese customers, and pressure has grown to extend those limits to more of its product line.

The CEO's argument is straightforward: China is not standing still. Cut off from foreign suppliers, Chinese chipmakers and equipment developers have intensified efforts to build domestic alternatives. Huawei, once dependent on global supply chains for its smartphone and infrastructure silicon, has re-emerged as a chip force and symbolizes what Beijing can achieve under restriction.

ASML occupies a singular position in this dispute. It is the sole supplier of extreme ultraviolet (EUV) lithography machines, the tools required to pattern the most advanced logic and memory chips at leading nodes. It also sells large volumes of deep ultraviolet (DUV) systems, which remain capable of producing mature-node and many mid-range chips — the segment where Chinese fabs have invested most aggressively in recent years.

That gives the company a commercial stake that few in the industry share. China has been ASML's largest market by system sales in recent quarters, as Chinese fabs rushed to stock up on DUV tools before potential further restrictions. Tightening those rules further would hit ASML's order book directly, while doing little to slow Chinese progress at nodes that DUV can already address.

The CEO's caution reflects a wider concern among equipment makers: export controls may slow China at the leading edge, but they also guarantee a captive market for any domestic toolmaker that reaches even partial parity. Huawei's return to advanced smartphone processors demonstrated that Chinese engineers can assemble leading-edge silicon with restricted access to foreign equipment — an outcome few policy makers anticipated when the first controls took effect.

For ASML, the risk is longer term. Each Chinese fab that learns to run without its tools is a customer that may never return, even if restrictions are later relaxed. The company's monopoly on EUV protects it today, but a Chinese effort to build homegrown lithography capability now has both state funding and urgent demand behind it.

The geopolitical context matters here because it directly reshapes the commercial picture. The Dutch government, acting under US pressure, has progressively aligned its export regime with American rules. ASML must navigate each new restriction while defending its share of the world's largest semiconductor equipment market.

The CEO's public warning signals that the industry's most strategically important supplier believes the current approach carries real costs — for its own business and for the stated goal of slowing China's chip advancement. How policymakers weigh that warning against security concerns will shape both ASML's revenue mix and the pace of China's push toward lithography independence in the years ahead.