ASML and Taiwan Semiconductor Manufacturing Co. have ways to disable the world’s most sophisticated chipmaking machines in the event that China invades Taiwan, according to people familiar with the matter.

Officials from the U.S. government have privately expressed concerns to both their Dutch and Taiwanese counterparts about what happens if Chinese aggression escalates into an attack on the island responsible for producing the vast majority of the world’s advanced semiconductors, two of the people said, speaking on condition of anonymity.

ASML reassured officials about its ability to remotely disable the machines when the Dutch government met with the company on the threat, two others said. The Netherlands has run simulations on a possible invasion in order to better assess the risks, they added.