S-47 / S-37 Berkut, Sukhoi continues development of possible next generation fighter - The Sukhoi Design Bureau of Moscow, Russia has developed the Su-47 (previously called the S-37 Berkut) fighter aircraft, which first flew in September 1997. The fighter was designed as a test demonstrator, but the design may form the basis of Sukhoi's nex - http://www.airforce-technology.com/projects/s37/index.html
Venik's Aviation - Venik's Aviation - world's leading Russian aerospace news web site. Latest news and technical information about Russian commercial and military aircraft and space vehicles. - http://www.aeronautics.ru/news/news002/fifth-generation_001.htm