A court in China has ordered Samsung Electronics to pay Huawei 80 million yuan in damages for patent infringement.
The Quanzhou Intermediary Court said three Samsung business units there must pay the sum to Huawei Device, the handset unit of Huawei.
The lawsuit was regarding patents in commercialized user interfaces (UI) such as widget design and how icons are arranged.
"Over many years, Samsung Electronics has pioneered the development of innovative mobile technologies through continuous investment in R&D to provide consumers with a wide selection of innovative products. We will thoroughly review the court's decision and determine appropriate responses," Samsung said in a statement to ZDNet.
It is the Chinese handset maker's first victory in a string of lawsuits filed in the US and China against its Korean counterpart.
Huawei filed lawsuits against Samsung in May last year in courts in the US and China alleging infringement of its 4G standard patents.
The South Korean firm countersued in China in July, arguing that Huawei's Mate 8 and Honor smartphones infringed its own patents.
Ruling on other patents that deal with core technologies -- such as 4G standards, of which the Chinese firm initially claimed infringement -- are yet to be announced.
Huawei was unavailable for comment at the time of writing.