After being sued by Apple for allegedly charging royalties on technology it did not own, Qualcomm is fighting back with a lawsuit of its own, claiming Apple is misleading and has breached its contract with the company.

Qualcomm has long been responsible for the wireless chips used in iPhones, iPads and many other Apple devices, but the relationship between the two turned sour back in January when Apple filed a $1 billion lawsuit against the chipmaker.

Google has been forced to hand over Android source code documents sought by Apple in an ongoing patent-infringement lawsuit against Samsung.

The search giant initially argued that it was not required to give up the documents and that it would be too burdensome to collect them, but U.S. Magistrate Judge Paul S. Grewal in San Jose, California, has given the company two days to give them up.

Nokia has sided with Apple in an effort to help the Cupertino company in its fight against Samsung. The Finnish firm filed an amicus brief on behalf of Apple in the U.S. Court of Appeals for the Federal Circuit on Monday, asking the court to permit permanent injunctions on the sale of Samsung smartphones that were found guilty of infringing Apple’s patents.