China was very notably an ally while the KMT was in power of mainland China.

Are you referring to Nazi-Germany or the US in this context?

The US.

Sounds very "Oceania was at war with Eurasia; therefore Oceania had always been at war with Eurasia"

(excerpt: https://www.abhafoundation.org/assets/books/html/1984/24.htm...)

Perhaps you are forgetting WWII, when China was a main member of a group which literally called themselves "The Allies" https://en.wikipedia.org/wiki/Four_Policemen

Calling yourself "the allies" doesn't make you long term allies.

It was just a group with a common enemy for short a time. Take Stalin, also part of "the Allies", he had invaded Poland together with Hitler and also invaded Finland. Couple of years later he was fighting Hitler because he got stabbed in the back by Hitler. And after WWII the west got into the coldwar with Stalin.

Very apt example on Stalin, exactly right.

> Calling yourself "the allies" doesn't make you long term allies.

The original claim was literally "China has never been a western ally". GP pointed out a counter example during WWII. Your response seems to be against a strawman argument...

Had the Nationalists in China prevailed against Mao they would have likely remained a Western ally. Certainly their descendants in Taiwan are today. But who knows?

It's one of the five permanent members of the UN Security Council for a reason.