Apple Watch & Apple care + Will buy

I'm going to buy an Apple Watch.

However, it is planning to purchase Apple Watch and Apple Care Plus from Korea or Germany.

Can I buy Apple Watch and Apple Care Plus at the Apple Store overseas?

(I'm asking because my address is a different country.)

Can I get Apple Watch repaired in another country?

I heard that can't receive Asian and European parts or specifications if they are different, but I ask the Apple Watch because I think, can receive them because the parts and specifications are the same.

I am delaying my purchase due to these issues. I hope this issue will be resolved.