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Haha, we all Slavs keep telling that to ourselves, don't we? :P

Eastern Europe starts at your home country's eastern border. E.g., if you're Russia, it's Japan and Alaska.

And Balkan on the southeastern.

To cite what might be deemed the lowest quality source possible: [1].

You'll find as many perspectives on what country belongs to East/West/North/South Europe as there are countries in Europe.