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Eastern Europe is multiple countries that were part of the U.S.S.R so it would make sense to differentiate when giving a geographical hint.
would make more sense to say Eastern Europe than Europe because

  • Europe has 50 countries
  • Eastern Europe has 16

If you posted a picture to name a city what kind of hint would you give east,west,north,south or somewhere in USA.

Romania was not part of USSR. Get your facts straight. Eastern Europe doesn't mean countries that where part of USSR.

get your hints right saying a clue thats 1 of 50 countries is too broad.
whether Romania was part of U.S.S.R doesnt change the fact that what you said wasn't a hint by any standard