Russia's Sukhoi Su-57 stealth fighter made a show at China’s International Aviation and Aerospace Exhibition, where Russian test pilot Sergey Bogdan praised its capabilities, calling it superior to any aircraft,

The long and troubled history of Russia's prized Su-57 fighter jet appeared to take another turn for the worse in recent days when what should have been an opportunity for the Kremlin to flex some military muscle turned into global ridicule and embarrassment.

Russia's state-run new agency, Interfax, confirmed that Moscow has signed the first deal for importing the Sukhoi Su-57 fighter jet. However, Russia has not disclosed the name of the buyer country.

Rosoboronexport, the agency that oversees the exports of Russian defense material, has announced the signing of the first export contract for the Su-57E, the international version of Russia’s fifth-generation fighter jet, the Su-57 Felon.

The Russian Sukhoi Su-57 "Felon" stealth fighter has faced continual challenges, with the latest embarrassment occurring at China’s Zhuhai Airshow. Poor build quality was apparent, drawing ridicule on Chinese social media and raising further questions about the jet's production integrity.

Here are all the details you need to know about the two fighter jets that are trying to put a competition against mighty the US at the world stage.