K-439 is a Russian submarine that belongs to the Project 877 class, also known as the Kilo-class. This class of submarines is known for its stealth capabilities and is primarily used for anti-submarine warfare, anti-surface warfare, and intelligence gathering. K-439 was launched in the late 1980s and has been part of the Russian Navy since then. The Kilo-class submarines, including K-439, are equipped with advanced sonar systems and can carry a variety of weapons, including torpedoes and cruise missiles. They are designed for both coastal and deep-sea operations, making them versatile assets in naval warfare.