K-4390 is a designation for a specific type of submarine, part of the Russian Navy. These submarines are designed for various missions, including reconnaissance and anti-submarine warfare. They are equipped with advanced technology to enhance their operational capabilities. The K-4390 is notable for its stealth features, allowing it to operate undetected in hostile environments. It is part of a larger class of submarines that contribute to the strategic defense of Russia. The vessel is also capable of launching cruise missiles, making it a significant asset in naval warfare.