With a situation as stated before, had the mongols invaded Western Europe, how the politics would be played out. Although Chivalry was the reigning mindset of the period, could the mongols depend on the Europeans to be honorable in battle? Or would they use ambush techniques? Also, what would the situation have been, say, had the pope declared an all out crusade against the mongols, every Christian man and woman was to take up arms and prepare to defend the realm. Or would the Europeans willfully bend the knee as to not cause too much destruction?

It has to be remembered, at the period of the mongol invasion, Europe had less people combined than Japan did at the same time. The what-ifs are too many, and I fear, far to late to speculate predictably.