The second stage engine, internally known as Izdelie-30, marked its first test flight in December 2017 on board a Su-57 fighter jet and further developments are going on, said Chechukov.
Beijing, Sept 20: Heavy rains and floods across China have left 57 people dead, dozens of others missing and hundreds injured, while more than a million residents have been evacuated from their homes, the government
London, Jul 11: David Ferrer beat Mardy Fish 7-5, 7-6 (3), 5-7, 7-6 (5) to seal Spain's Davis Cup quarterfinal win over the United States on Sunday, while defending champion Serbia advanced to the semifinals
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