Taiwan has put Chinese tech giant Huawei and chip titan SMIC on an export blacklist, further squeezing Beijing’s access to the technology needed to build the most advanced chips.

Huawei and Semiconductor Manufacturing International Corp were among 601 entities added to Taiwan’s “strategic high-tech commodities entity list”, the Ministry of Economic Affairs’ International Trade Administration said Sunday.

“Based on the prevention of arms proliferation and other national security considerations, a total of 601 entities involved in arms proliferation activities were added to the list …[“strategic high-tech commodities entity list”, the Ministry of Economic Affairs’ International Trade Administration said]… including Chinese companies such as Huawei and SMIC,” the administration said in a statement.