Russian
The Russian Su-25.
The Russian Su-25 Groch, or "Rook" in Russian, and US A-10 Thunderbolt II, or "Warthog," are similar in many ways.
They're both heavily armored. They're both able to execute extremely low-altitude sorties and bombing raids. And they've both even been described as "flying tanks."
Production on the Su-25, which the US calls the "Frogfoot," and the A-10 Warthog both began in the 1970s, and they've since been used quite extensively.
Check out how the two aircraft match up below: