The Varshavyanka is a class of diesel-electric submarines developed by the Russian Navy. Known for their stealth and advanced technology, these submarines are designed for anti-submarine warfare, anti-surface warfare, and intelligence gathering. They are equipped with modern sonar systems and can launch various types of missiles. These submarines are also referred to as the Project 877 Paltus and Project 636 Varshavyanka. They are notable for their ability to operate in shallow waters and their relatively quiet operation, making them effective in coastal defense scenarios. The Varshavyanka class has been exported to several countries, enhancing their naval capabilities.