Bulgaria

Bulgaria is a country in Eastern Europe. During the First Tiberium War, it was neutral a bit earlier before Nod decided to capture the country.

First Tiberium War
When the Nod government in Latvia feared that the GDI air force was destroyed and fled to Jelgava, both Kane and Seth in revenge invaded netural Ukraine as their army wasn't enough to overwhelm the Nod offensive and also crushed Romania and Bulgaria nearing Greece, Turkey and the Black Sea. The Nod forces occupied it throughout half of the war before GDI were able to rescue Delphi and crushed the Nod resistance in Bulgaria before reaching inside Nod's territory and conquered Sarajevo.