When importing members, the country code should be based on the ISO 3166 Code. This is a 2 letter code that represents a country. So for example:
- United States: US
- United Kingdom: GB
- United Arab Emirates: AE
- Costa Rica: CR
- Canada: CA
If a 3 letter code is added by mistake, only the first 2 digits will be taken into consideration. If UAE is added for example for the United Arab Emirates, it would actually show as Ukraine since Ukraine's ISO 3166 Code is UA:
Country Codes List
Find more information about the ISO 3166 code for all countries: ISO 3166 - Country Code List