The Sverdlov-class cruisers, Soviet designation Project 68bis, were the last conventional gun cruisers built for the Soviet Navy. They were built in the 1950s and were based on Soviet, German, and Italian designs and concepts developed before the Second World War. They were modified to improve their sea capabilities, allowing them to operate at high speeds in the rough waters of the North Atlantic. The design carried an extensive suite of modern radar equipment and anti-aircraft artillery. The Soviets originally planned to build 40 ships in the class, to be supported by the Stalingrad-class battlecruisers and various aircraft carriers.