Things are looking worse for Huawei as South Korean chipmakers Samsung and SK Hynix are reportedly suspending shipments to the embattled company.

US officials have been tightening the noose around Huawei, a company they claim is a threat to national security. All Chinese companies are required to cooperate with Chinese authorities, but Huawei is largely considered to have much closer ties with Chinese military and intelligence officials than other companies.

As a result, the US has been working to isolate Huawei, pressuring allies to ban the company’s equipment and imposing sanctions that prohibit suppliers from doing business with it. This even applies to overseas companies that base some of their products on US tech. TSMC has already committed to cutting off Huawei, prompting the Chinese firm to warn that production of its custom smartphone chips were in jeopardy.

Now, according to UPI, Samsung and SK Hynix are following suit. This move will only increase pressure on a company already reeling from bans and sanctions.