ZTE didn’t instantly react to a request for opinions.

The Chinese business was purportedly attempting to conceal the illegal technology shipments and had been acquiring contracts to construct Iranian mobile and landline networks. But in 2012, Reuters disclosed that ZTE was selling surveillance equipment with the capacity of spying on web and cellular communications to Iran.

In the year 2012, the U.S. started probing ZTE over the prohibited sales.

When the business was found selling the technology, the Chinese business still restarted the prohibited shipments to Iran, the Justice Department said.