I have heard that Slavic languages under the same branch, such as Polish, Czeck and Slovak of West Slavic Branch or Russian, Ukrainian and Belarusian of East Slavic Branch, can quite close and similar and their speakers can generally understand each other, just like Spanish and Portugese.
Is that true?
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I don't know if they can fully understand but my polish friend understood this one Russian girl when she was speaking Russian. He said something about understanding some words or phrases.0