By coincidence I checked the mail today and the book "August Storm: Soviet Tactical and Operational Combat in Manchuria, 1945" by LTC David Glantz was already here. Sadly it doesn't mention specific aircraft by types, but does emphasize the use of tactical airpower in support of the operations. 1,500,000 ground troops in the assault against the Japanese. The fight lasted 7 days. In just one section of the fight, the Soviets acknowledged 32,000 dead.
Guess it wasn't a mop up, little affair against the Japanese. Gonna have to look elsewhere for KingCobra specifics with the Soviets, but clearly there was something of a fight where they were a part of the order of battle. While it may not have been a huge air to air war, clearly air to ground was a big deal.