What I read of Khalkin Gol basically explained as a Russian victory. It is a point though about Japan invading the USSR, for at the time of Pearl, Zhukov's army (The one that defeated the Japs in 1938) was speeding west for the aid of Moscow.
It could do so safely for the help of one person, - the spy Sorge. Sorge was based in Tokyo and gave the Russians clear information about the Japs NOT intending to deal with the USSR.
And it was Zhukov's army that helped the Russians win the battle of Moscow,- with Zhukov tied up in the east (and this is an ENORMOUS distance) or two fronts at the same time, I am afraid the Russians would have lost.
IMHO, attacking the USA was a silly thing. The Japs should have left them and tied down Zhukov insteadas well as grabbing Burma from the British. Starting with Zhukov. Well, maybe just me, but had I been Tojo, that's how I'd have done it
No gamble with uncle Sam....