One of the reasons the Russians resort to cyber attacks is that much of their gear is crap

 Sandboxx:

IS RUSSIA’S SU-57 THE WORST STEALTH FIGHTER ON THE PLANET?

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 In December of 2019, just days before the Russian military expected to receive their first serial production Su-57, the program was met with yet another dramatic setback. Sukhoi, the firm tasked with developing the Su-57, was conducting flight testing with the fighter to ensure it met the requirements for delivery when the aircraft crashed just 111 kilometers from the airfield it departed from.

The pilot, a civilian contracted with Sukhoi, ejected and survived, but the aircraft was a total loss. In the days that followed the crash, Russian investigators would cite a failure of the tail’s control surfaces for the incident, limiting the pilot’s ability to control the aircraft. According to Russian media outlets, the aircraft exploded upon impact with the ground.

It was a significant setback for a fighter program that had already spanned nearly five decades in its various iterations and a huge blow to Russia’s fragile reputation as a global military power. Shortly after the crash, Igar Ozar, the CEO of Sukhoi, resigned from his position.

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The Russians introduced the pane later to its war in Syria and quickly sent them back home.  They have not been able to mass-produce them in any quantities.