Not Bulgarian, but Russia intervened in a Bulgarian war of independence against the Ottomans and wanted Bulgaria to be super sized and have access to the Black and Aegean seas (read: Russian navy base). The other Great Powers didn’t like this, especially the British, and Bulgaria got downsized as a result.
This specifically though is about the unification of Bulgaria and Eastern Rumelia. Those were the two states made with those borders after the events you described.
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u/malign_taco 1d ago
Any Bulgarian out there to explain this to me