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https://en.wikipedia.org/wiki/Battles_of_Khalkhin_Gol

The battle of Khalkhin Gol/Nomonhan ended with an armistice by 15 September 1939.

After that the Japanese became far more circumspect and dropped aggressive probing of the USSR that had characterized earlier points in the 1930s.

Eventually, the two states signed a Neutrality Pact in April 1941, that lasted until the Soviets broke the pact in August 1945. https://en.wikipedia.org/wiki/Soviet–Japanese_Neutrality_Pact

Since their border clashes stopped, and neither were planning to attack the other, why did it take so long (20 months, almost 2 years) for them to reach a Neutrality Pact?

Which sides' intransigence was more to blame?
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