Key Points – Algeria has become the first export customer for Russia’s Su-57 “Felon” fifth-generation stealth fighter, with an initial order for six Su-57E variant aircraft expected for ...

While it's still true that the Su-57 lags behind the U.S. F-22 or China's J-20 in stealth, claims that it's poorly built based on a decade-old prototype don't hold up under scrutiny.

Russia has further suggested that an upgraded and even more advanced model of the Su-57 could be in the works and that it would be the world’s first in-service “sixth-generation” aircraft.

In many ways, the Su-57 is similar to the F-22 Raptor, as it's the first of its kind for Russia in much the same way the American fighter is to the West, though it came after the F-22's introduction.