It is little known that Bulgaria once operated a significant fleet of reconnaisance aircraft that at one point even included a number of MiG-25RBT 'Foxbats'. Bulgaria was the only Warsaw Pact country to operate the mighty Foxbat, the highly specialised nature of which and prohibitive operating costs were apparently enough to dissuade all other Warsaw Pact members from acquiring the aircraft. Bulgaria itself would only purchase four MiG-25s, which likely did little to improve the operations and maintenance costs per unit while they were in operational service.