President Rosen Plevneliev, who is also commander in chief of the Bulgarian army, said Bulgaria's ageing Mig-29 jet fighters had been deployed 2-3 times a week in recent months, compared with a previous rate of 2-3 times a year. Russia may be deliberately provoking such flights to exhaust the flying capacity of Bulgaria
http://news.yahoo.com/bulgaria-wary-russia-steps-military-flights-over-black-165953119--sector.html
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