EU border protection agency Frontex will triple the number of its officers at Bulgaria’s external Schengen borders with Turkey and Serbia. From March 20, there will be a further 500 to 600 Frontex officers in Bulgaria, explained agency director Hans Leijtens on Thursday at the Kapitan Andreevo checkpoint on Bulgaria’s border with Turkey. Leijtens and Bulgarian Interior Minister Kalin Stoyanov had previously inspected the guarding of Bulgaria’s land border with Turkey, the Bulgarian news agency BTA reported. Bulgaria has a “very important” role in guarding the EU’s external borders, Leijtens em…