Project 636 is a Russian naval initiative aimed at modernizing and enhancing the capabilities of the Project 636 submarines, also known as the Varshavyanka-class. These submarines are designed for anti-submarine warfare, anti-surface warfare, and intelligence gathering, making them versatile assets for the Russian Navy. The project focuses on upgrading the submarines' stealth features, weapon systems, and onboard technology. The Project 636 submarines are known for their quiet operation and advanced sonar systems, which allow them to operate effectively in various maritime environments, contributing to Russia's strategic naval presence.