Vazrazhdane leader Kostadin Kostadinov says North Macedonia and the Ukrainian part of Southern Bessarabia should be added to Bulgaria.
Policy rate lowered despite slight rise in inflation, attributed to higher food prices.
wiiw report warns lower investment trend could continue as Central and Eastern Europe's role as a production hub for Western companies is waning.
The enlargement process has been revitalised since the start of the war in Ukraine, but EU ministers say candidate countries must step up reform efforts.
Artan Grubi was recently blacklisted by the US State Department for alleged involvement in significant corruption.