A new report could ultimately prove another bombshell in Huawei’s ongoing conflicts with the U.S. government. New documents obtained by The Washington Post tie the Chinese hardware giant to North Korea’s commercial 3G wireless network.

If proven, the ties would be yet more fodder for the U.S., which has already dinged the company over charges of violating Iran sanctions. The government has also investigated potential ties between Huawei and North Korea for years, though concrete links have apparently remained elusive.

This latest report arrives by way of a former Huawei employee, with confirmation and supporting documents from other sources who have also requested to remain anonymous for fear of retribution. For its part, Huawei has stated that it has “no business presence” in the embattled country.

“Huawei is fully committed to comply with all applicable laws and regulations in the countries and regions where we operate, including all export control and sanction laws and regulations,” it said in a statement offered to the press. Notably, the statements appear to apply primarily to its current business offerings, while declining to comment on the past.

The specifics of the dealings are a touch complicated. According to the documents, Huawei partnered with Panda International Information Technology, a state-owned Chinese communications company. Huawei reportedly used the firm to send networking equipment to the country in order to launch wireless carrier Koryolink over a decade ago.

The company has been under additional scrutiny recently as carriers have begun to roll out 5G networks across the globe. We’ve reached out to Huawei for additional comment.