Apple issued a brief statement today announcing that they’re responding to Nokia’s lawsuit by launching one of their own. Fight fire with fire, I (and, apparently, Apple) always say. Apple is claiming in the countersuit that Nokia is infringing upon 13 Apple patents. The company claimed back in October that it planned to “vigorously” defend itself against Nokia’s lawsuit, and I guess this is one way to do that.

In the 10-K annual report (PDF) Apple filed with the U.S. Securities and Exchange Commission (posted yesterday), the company made note that it plans to “vigorously” defend itself in a lawsuit that Nokia filed last week. The lawsuit claimed Apple had infringed multiple cellular and Wi-Fi patents in their iPhone, which Nokia apparently owned.