The Krivak II is a class of guided missile frigates developed by the former Soviet Union. Designed for anti-submarine warfare, these ships are equipped with advanced sonar systems and missile launchers. They serve primarily in the Russian Navy and are known for their stealthy design and versatility in various naval operations. The Krivak II class features a displacement of around 3,600 tons and can reach speeds of up to 30 knots. These frigates are armed with a combination of surface-to-air missiles, anti-ship missiles, and torpedoes, making them effective in both offensive and defensive roles at sea.