Countries Identified By Only Their Vowels - First Vowel U OR Y
Each combination is unique, so there is only one country that satisfies the answer.
You may use the conventional short names or, sometimes, abbreviations. However, each hint is based on the countries' full, English name, so be careful with countries like Bosnia or Antigua (not on this quiz). Spelling counts. I know you know the countries; time to learn how to spell them.