'''Eastern Europe''' is a region of [[Europe]] that consist of [[Russian Federation]] (its European part), and occasionally [[Belarus]], and [[Ukraine]]. These countries are about 50% of European landmass.
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'''Eastern Europe''' is a region that roughly includes the countries of [[Poland]], [[Hungary]], [[Czechia]], [[Slovakia]], [[Romania]], [[Bulgaria]], the [[Baltic states]],[[Russia]] (European part), and [[Belarus]], the [[Ukraine]] and others. These countries are about 50% of European landmass. It is the region where two world wars erupted in the 20th century.