What are ASEAN+1, +2 and +3?

Question

Are the "plus" countries fixed or changing? The info I get from the Internet seem to be unclear, especially on +2 and +1. Thanks for your help.

Answer 1

ASEAN has 10 members:
Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand and Vietnam.

When you see ASEAN +1 or ASEAN +2 it means meetings between ASEAN and countries/dialogue partners outside ASEAN, for example,
ASEAN+1 means ASEAN + China or Japan or Korea or India.
So in this case the plus country is not fixed.

ASEAN+3 means ASEAN+China+Japan+Korea; that's fixed.

ASEAN+2 I am not sure, it could refer to ASEAN+Australia and NewZealand, although that's calles ASEAN-CER, and if that is the case, then it's fixed.