Koesmoyo Ponco Aji (2026) “KEHILANGAN KEWARGANEGARAAN REPUBLIK INDONESIA (STUDI KASUS KETERLIBATAN WARGA NEGARA INDONESIA SEBAGAI TENTARA ASING DALAM KONFLIK RUSIA-UKRAINA): LOSS OF REPUBLIC OF INDONESIA CITIZENSHIP (A CASE STUDY ON THE INVOLVEMENT OF INDONESIAN CITIZENS AS FOREIGN SOLDIERS IN THE RUSSIA-UKRAINE CONFLICT)”, Journal of Law and Border Protection, 8(1), pp. 37–57. doi: 10.52617/jlbp.v8i1.930.