https://fulcrum.sg/southeast-asias-s...a-ukraine-war/
Fulcrum has a commentary of Southeast Asian volunteers fighting in the legion. There's an exception to this as one Vietnamese man is serving with the regular Ukrainian military after he was given Ukrainian nationality (He'd also avoid jail time in case Vietnam wants his ass hauled off).
Russian MOD has a Telegram list of KIA volunteers.
They list the following from SEA: Philippines (17 volunteers, two “eliminated”); Indonesia (ten volunteers, four “eliminated”); and Thailand (three volunteers, one “eliminated”).