What would it take for China and Japan to be Allies?

Like Post 1800, how could Japan and China be allies? They must be partners by at least the 1990s. So, there is a 190 year space for anything to occur ,so that China and Japan may be allies. I am going to leave the question as simple as this since I don't want to ruin any possibilities as long as it's not ASB.
 
Thinking it in the same time that I write it, so it may not be hugely coherent.

1) A crushing French victory in the Sino-French war, it could lead to not only a lesser Chinese presence in southern seas (Pesacores Island being probably swalloed up by France, for exemple)
2) An harsher Russian pressure (no Treaty of 1881, or at least, one more favourable to Russia) on Turkestan and early on Manchuria, up to a Russian protectorate on Korea.

I'm not sure on how much both of these are plausible and if it could really have as much consequences, but making European powers the monopolizers of two regions that Japan had interest to (Korean peninsula and South China Sea) could lead to a rough alignment.
 
The Manchus get deposed,a native dynasty successfully reforms China into becoming a modernised nation.China re-establishes hegemony over East and Southeast Asia.Japan,following tradition,kowtows China as the big brother of the region and becomes one of China's enforcers,much like the UK's relationship with the US post 1945.

Unless China is a significant power herself,Japan,starved of resources,is bound to try to attack and get Chinese resources if it's more powerful than China.
 
If the UK and France have been solid allies for so long despite that long, long history of rivalry, surely some circumstance could occur that could make China and Japan be allies. I'm just guessing this would involve European colonialism in some way, shape, or form.
 
Japan doesn't try to modernise in the mid 19th century. It remains similar to Qing China in resisting change and decays.

By the turn of the century, both countries realise they are in the same boat trying to resist Western imperialism and forge a cooperative relationship.
 
A weaker Japan and stronger Russia that scares both China and Japan into allying. Prior to the actual wars between China and Japan there was no great beef between them, so if the Meiji restoration is delayed and Russia has even more success in Manchuria and Korea the logical route for China and Japan is cooperation. It's unlikely that some sort of Pan-Asianism will be able to create such an alliance without a real cause for one, but a real cause for one might create a stronger Pan-Asian identity.
 
Chinese revolutionaries and reformers actually admired Japan until it started to become expansionistic, and plenty of Chinese exiles fled to Japan. Absolute latest chance for friendly relations is the end of the Taisho democracy, I'd say.
 
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It's a joke.

France and Germany are allies. America and Britain are allies. Poland and Germany get along okay.


So, sure could happen.
 
A treaty of mutual respect and recognition of areas of interest and mutual development anytime after the Tokugawa shogunate. Now the Europeans can't play them off each other silk vs. silver commodity wars and it's not THEIR game anymore.
 
I've had the an idea for a tl where the General Sherman Incident leads to war, the United States wins the Joseon-American War and creates a system that might not be called colonization but is close enough that Japan and China see no difference. They won't be allies but they'll have a mutual enemy in the United States and the question of who should colonize the Korean peninsula if the Americans were ever forced out is kicked down the road.
 
A thriving, industrializing, and newly independent Republica de Nusantara with a PoD from the early 1600s? :p
 
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