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http://www.aeronautics.ru/news/news002/fifth-generation_001.htm

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 next generation fighter for the Russian Air Force.
http://www.airforce-technology.com/projects/s37/index.html

Sukhoi Wins Battle For Russian Fighter Follow-On
Sukhoi has emerged as the victor in Russia's long-running design-bureau battle to lead development of its air force's so-called fifth-generation fighter effort.
http://www.aviationnow.com/content/ncof/ncf_n73.htm