Wiki says - Japan used about 400 aircraft during
the Battles of Khalkin Gol , Russia used more than 900 aircraft.
Russia lost 208 aircraft.
Japan lost 162 aircraft.
Looking at airlosses, Japan seems to be the winner.
The side that wins air war (almost) always takes notably more loses. You can look at German early campaigns and see how they lost more planes than Poland, and more planes than France. And Allies lost notably more planes when they had almost complete superiority over Germany in 1944-1945.
After all, air war is waged not to get favourable kill ratio, but to get bombers and reckon planes to do their job.
Actually, the fact that the Soviets had 2-3x as much fighters sealed the deal. The i-16 was an inferior fighter plane to the KI-27.
It was inferior in some types of copmbat, which, forced Soviets to innovate tactic. Oh, exactly like Americans in 1941, which, wait for it, was my entire point.
Even so looking at the following stats I dont think the Soviets had complete air superiority, and the definitely did not wipe the japanese.
Soviets ended up with complete air superiority. Soviets had 900 aircraft’s, and lost and sent to repair slightly over half of their force.
The Japanese combat losses were 97 fighters, 25 bombers and 41 other (mostly reconnaissance), while 128 fighters, 54 bombers and 38 other required repairs due to combat damage.
So, out of 400 aircraft’s, 220 were lost, and almost every single remaining was heavily damaged, and probably repaired a few times over.
That, shows that by the end of conflict, Japanese air arm was fully exhausted, while Soviet one was perfectly operational. Hence, Japanese were wiped, and Soviets convincingly won.