Defence Blog: Russian Su-57 fighters cause mysterious sound that frightened Moscow residents.
Numerous people reported hearing the strange high-pitched ringing sound during a rehearsal of the Victory Day Parade in Moscow, while the four newest Russian Su-57 Felon fighter jets appeared in the sky.
A Moscow resident has described hearing a mysterious ‘scary’ noise in the skies above the city as ‘like something a real howl’.
The Frelon reportedly continues to suffer from developmental issues, including the production of the new turbofan engines. The initial serial production versions lack the promised new-generation engines.
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WNU Editor: Russia's Victory Day Parade is on Sunday, May 9.
