Let me guess: You are an American with no clue about Geography / foreign politics?
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Belarus isn’t in the EU. Its position doesn’t matter, independent from which side they are on.
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Belarus is part of the big grey blob in the east of the map (alongside Ukraine and Russia). So the map doesn’t state anything about Belarus’ opinion on the topic.
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In case you thought the dark green blob in central Europe is Belarus: those are Germany and Poland.
This trivial result is left as an exercise to the reader.