У опублікованих документах (листи, телеграми), що зберігаються у Центральному державному архіві вищих органів влади та управління України, йдеться про діяльність Міністерства закордонних справ УНР та Надзвичайної дипломатичної місії УНР в Румунії в особі їх керівників - Андрія Ніковського та Костянтина Мацієвича. Документи охоплюють період з 7 квітня 1920 р. до 21 листопада 1921 р. та стосуються широкого кола проблем зовнішньої політики напередодні та в перші роки еміграції Уряду УНР. In the published documents (18 letters and 3 telegrams), which are kept in the fund 3696 "The Ministry of Foreign Affairs of the Ukrainian People's Republic, 1918-1924" in the Central state archive of highest authorities and management of Ukraine, the information is provided about the activities of Ukrainian diplomats Kost’ Matsiyevych and Andriy Nikovsky. At that time the first one headed the Ministry of Foreign Affairs of the Ukrainian People's Republic, the latter was the head of the UPR extraordinary diplomatic mission in Romania. The documents cover the period from April 7, 1920 to November 21, 1921. The sender of 13 letters and 2 telegrams is Kost’ Matsiyevych while the author of 5 letters and 1 telegram is Andriy Nikovsky. The documents concern a wide range of foreign policy issues on the eve and during the first year of the UPR government’s immigration. The most important problems mentioned there include the following items: financing the activities of the UPR government, the Ukrainian delegation at the Prague Peace Conference, the Ukrainian embassy in Turkey, the UPR extraordinary diplomatic mission in Romania, the UPR military mission in Romania; the return of prisoners of war, World War I disabled persons and refugees; negotiations about the joint actions of the UPR army and Wrangel’s “Russian army” against the Bolsheviks; the imposition of the UPR embassy in Bulgaria governor’s duties on Kost’ Matsiyevych; the development of relations with Bulgaria, Poland and Romania, the review of the political and social-economic situation in those countries; the issue of the UPR’s joining the League of Nations, discussing the Ukrainian issue in the League of Nations; the supply of arms and ammunition to Ukraine; the implementation of the cultural diplomacy; ensuring the tour of the Ukrainian republican choir’s headed by O. Koshits; providing the organizational and financial support for the Bessarabian group during the second winter military campaign of the UPR army; termination of the UPR diplomatic mission in Romania activities and its functions transfer to the Civilian assistance of Ukrainian immigration committee.