There were several encounters between Japanese army and navy air forces against Soviet VVS and volunteers squadrons over Nomonhan (Khalkin Gol) and China. Air battles involving I-152s, I-153s, I-16s, SB-2s, DiSh-3s, DB-3s versus A5M2/4s, G3Ms, Ki-10s, Ki-27s, Ki-30s, Ki-32s. I have a book on the subject in Russian, unfortunately difficult to translate for the moment. I suggest then that you take a look on George Mellinger's extensive research on that area available at these links here:
Soviet Fighters in the Sky of China.
China Skys Part II China Skys Part III Soviet Fighters in the Sky of China IV Soviet Fighters in the Sky of China Part 5 Soviet Fighters in th eSky of China VI
Over Manchuria and Korea in 1945 during operation August Storm, Soviet pilots acheived 4 or 5-0 count against Japanese opposition.
One P-63 pilot (Jr. Lt. Miroshnichenko) is said to have shot down a Ki-27 Nate or Ki-43 Oscar over Mongolia.
While Soviet naval pilots scored a total of 4 aerial victories, details of three being available.
On August 10, 1945 Junior Lieutenant Korshunov of the 50 OMRAP (Ind. Naval Reconnaissance Air Regt.), flying a Yak-9 encountered and shot down a Kawanishi H6K Mavis over Rasin (later Najin) in the Northeastern-most corner of Korea.
On August 15, 1945, at 13:30 hours, 29 Pe-2 dive bombers of the 55 BAP bombed the railroad station at Ranan (later Nanam). A Pair of J2M Raiden fighters tried to intervene and an escorting Yak-9 of the 19 IAP shot down one of them, the other escaping.
At 17:18 hours that same day, 34 Pe-2s of the 33 BAP, again escorted by the Yak-9s of the 19 IAP, attacked the station at Funei (late Nuren). Again there was token opposition, and once again a J2M was shot down; this time the pilot was identified as a Lieutenant Grib.
There is also mention of a Japanese Kamikaze air attack that sunk Soviet Minesweeping cutter (mottor boat) KT-152 on 18th or 19th August 1945 in the Shimushu area during the operations over Kuriles.