The Sovermenny class destroyers were produced by the Soviets in the late 1980's to specifcally threaten U.S. carriers. The Chinese have purchased four of these vessels and refitted and renamed them the Hangzhou class. The Russians modernized the design throughout the 1990's before their sale to the Chinese and they are an example of the type of equipment the Chinese are purchasing with their new found wealth and technology (mostly ammassed from trade with the United States and other western countries). These ships are very capable, mulit-purpose guided missile destroyers and carry the Sunburn and Yahkont surface to surface missiles which were specifically designed by the Russians to attack U.S. super-carriers and defeat the Aegis air defense system. These vessels aslo have a credible medium-ranged anti-air defense system suitable for their own protection, or close in protection of other vessels.