How much are East Asian / Mongoloid people (Chinese, Japanese, Korean, Malaysian, Thai) culturally united?

Question

Races develop when a particular group of people stay in a particular geography. As people of the same race stayed together closely thus they developed similar cultures.

Say European people (white people) have similar cultures, Mongoloid people such as people in China, Korea, Japan, Thailand have similar cultures [such as similar cloths pattern, house designs, using chopsticks, foods, battle gear, traditional hats, traditional fans, language patterns] (except the native Americans as they have migrated there too long back from their fellow Mongoloids before a distinct culture devel in East Asia). Native Africans have similar cultures. Middle Easterns (brown people) have similar cultures.

How much are East Asian / Mongoloid people (Chinese, Japanese, Korean, Malaysian, Thai) culturally united?

Do a Chinese, Japanese, Korean, Malaysian, Thai help each other as as much as the help a Spanish, Scottish, English, Italian help each other (the European Union is an example).

Answer 1

I'm Filipino and from what i observe we here in South East Asia are very much united. Just recently, the 40th ASEAN (Association of SouthEast Asian Nations) Meet was held in Singapore. You can find all the facts about this association in the website below.

Answer 2

My wife is Chinese and I know that Chinese and Koreans get along very well. There was friction in the past between them and Japanese but a lot of that is forgotten  (One of my wife's friend's came from Japan to see our wedding).  My wife's brother is married to a Filipino but his spouse said Filipinos sometimes found Chinese people to be a little uppity.