ASEAN, or the Association of South East Asian Nations, is an organization mentioned in Call of Duty 8: New World. Its 10 members in 2052 are Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand, and Vietnam.
In Call of Duty 8: New World, the group was mentioned to have nearly split up, as Vietnam, Laos, and Myanmar supported the SCO unofficially, while the remaining 7 members wanted to go to war with the SCO. However, in Call of Duty: New World 2, it is known that ASEAN declared war on the Shanghai Cooperation Organisation, as well as Korea, for its aggression on other Asian states. Apparently by this time Vietnam, Laos, and Myanmar had decided that attacking the SCO was the right thing to do, but this is unconfirmed.