Another interesting website:
http://aces.safarikovi.org/victories/sssr-japan.1945.html which shows Soviet kills during the "Manchurian Strategic Offensive Operation"
A total of 10...which doesn't sound like many until you dig into the details of what the Japanese did/did not have in the air, i.e. not much.
The table in the website shows:
1) The single confirmed(?) air-to-air kill of a P-63 against a Ki-43 (likely) or Ki-27 (possible) over Mongolia
2) Two "taran" (ramming) kills by pilots of the 22nd IAP, which just happened to be
equipped with P-63's although there are no details - which fits into the Soviet attitude of Lend-Lease denial
Incidentally, the russian at the bottom of the table translates to:
17 IAP: 17 th Fighter Aviation Regiment of the Order of Suvorov, 190 th Fighter Polotsk Red Banner Order of Kutuzov Air Division, Air Force, the Trans-Baikal Front.
19 IAP : the 19 th Fighter Aviation Regiment, Air Force, Pacific Fleet.
22 IAP : 22 th Fighter Aviation Regiment of Red Halhingolsky, 246 th Fighter Mukden Air Division, 12 th Air Army, Air Force, the Trans-Baikal Front.
45 IAP : the 45 th Fighter Aviation Regiment, Air Force, Pacific Fleet.
50 50-th separate long-range reconnaissance Aviation Regiment, Air Force, Navy front.