Apple filed a lawsuit against Qualcomm in Beijing, alleging that the chip supplier abused its clout in the chip industry and seeking 1 billion yuan ($145.32 million) in damages, Beijing’s Intellectual Property Court said in a statement on Wednesday.
Qualcomm is a major supplier to both Apple and Samsung Electronics
for “modem” chips that connect phones to wireless networks. The two companies together accounted for 40 percent of Qualcomm’s $23.5 billion in revenue in its most recent fiscal year.
The lawsuits follow a decision by the U.S. Federal Trade Commission to file a complaint on Jan. 17 in which it accused Qualcomm of using anticompetitive tactics to maintain its monopoly of a key semiconductor used in mobile phones.
Get Data Sheet, Fortune’s technology newsletter.
Apple followed with a related lawsuit last Friday. It asked a federal court in California for $1 billion in promised rebates and accused Qualcomm of overcharging for chips.
Qualcomm did not immediately reply to a request for comment. The company said previously that it would contest both the FTC and the Apple lawsuit filed in the United States.
The chip maker faces legal challenges across the globe.
South Korea’s antitrust regulator fined Qualcomm 1.03 trillion won ($854 million) in December for what it called unfair practices in patent licensing, a decision the U.S. chipmaker said it will challenge in court.
In February 2015, Qualcomm paid a $975 million fine in China following a 14-month probe, while the European Union in December 2015 accused it of abusing its market power to thwart rivals.