Chinese smartphone maker ZTE Corp’s US woes deepened this week, as regulators proposed new rules that could cut into its sales, while a supply ban means it may not be able to use Android software in its devices, according to a source.

The US Commerce Department banned American firms on Monday from selling parts and software to ZTE for seven years. The move was sparked by ZTE’s violation of an agreement that was reached after it was caught illegally shipping US goods to Iran.

Then on Tuesday a US telecoms regulator proposed new rules that would bar government programmes from buying from companies that it says pose a security threat to US telecoms networks, which will likely hurt both ZTE and rival Chinese smartphone maker Huawei Technologies.

The moves threaten to further complicate relations between the US and China. The two countries have already proposed tens of billions of dollars in tariffs in recent weeks, fanning worries of a full-blown trade war that could hurt global supply chains as well as business investment plans.

The Commerce Department deci­sion means ZTE Corp may not be able to use Google’s Android operating system in its mobile devices, a source familiar with the matter said on Tuesday. ZTE and the Alphabet Inc unit have been discussing the impact of the ban, the source added, but the two companies were still unclear about the use of Android by ZTE.

ZTE shipped 46.4 million smartphones last year, placing it seventh among Android-based manufacturers, ac­cor­ding to IHS Markit.

The proposed new rules from the Federal Communications Commission (FCC), meanwhile, which are expected to be finalised this year, appear to be another prong in a US effort to prevent ZTE and Huawei from gaining significant market share in the US.

They would prevent money from the $8.5 billion FCC Universal Ser­vice Fund, which includes subsidies for telephone service to poor and rural areas, from being spent on goods or services from companies or countries which pose a “national security threat to the integrity of communications networks or their supply chains,” the FCC said.