April 16, 1949, both countries signed an agreement on friendship and co-operation. On July 25, 1949, the Hungarian government committed to return artistic and historical relics that had been seized after the First Vienna Award. The final agreement was signed on November 11, 1951, with a validity of ten years but was not fully respected. See also Second Vienna Award Carpathian Rus German occupation of Czechoslovakia Carpatho-Ukraine Molotov–Ribbentrop Pact Salzburg Conference Notes References Sources Piahanau, Aliaksandr. Slovak-Hungarian relations in the mirror of the Soviet-German conflictive alliance (1939–1941), in: Prague Papers on the History of International Relations 2 (2012): 144 – 163. https://halshs.archives-ouvertes.fr/halshs-01261457/document Deák, Ladislav, Hungary's game for Slovakia, Slovak Academy of Sciences, 1996. (translation of Hra o Slovensko) Encyklopédia Slovenska (Encyclopedia of Slovakia), vol. VI, Slovak Academy of Sciences, 1982. Jerzy Kupliński, "Polskie działania dywersyjne na Ukrainie Zakarpackiej w 1938 r." ("Polish 1938 Covert Operations in Transcarpathian Ukraine"), Wojskowy Przegląd Historyczny (Military Historical Review), no. 4, 1996. Kronika Slovenska (Chronicle of Slovakia), vol. II, Fortuna Print Praha, 1999. Józef Kasparek, "Poland's 1938 Covert Operations in Ruthenia", East European Quarterly", vol. XXIII, no. 3 (September 1989), pp. 365–73. Józef Kasparek, Przepust karpacki: tajna akcja polskiego wywiadu (The Carpathian Bridge: a Covert Polish Intelligence Operation), Warszawa, Wydawnictwo Czasopism i Książek Technicznych SIGMA NOT, 1992, . Edmund Charaszkiewicz, "Referat o działaniach dywersyjnych na Rusi Karpackiej" ("Report on Covert Operations in Carpathian Rus"), in Zbiór dokumentów ppłk. Edmunda Charaszkiewicza (Collection of Documents by Lt. Col. Edmund Charaszkiewicz), opracowanie, wstęp i przypisy (edited, with introduction and notes by) Andrzej Grzywacz, Marcin Kwiecień, Grzegorz Mazur, Kraków, Księgarnia Akademicka, 2000, , pp. 106–30. Paweł Samuś, Kazimierz Badziak, Giennadij Matwiejew, Akcja "Łom": polskie działania dywersyjne na Rusi Zakarpackiej w świetle dokumentów Oddziału II Sztabu Głównego WP (Operation Crowbar: Polish Covert Operations in Transcarpathian Rus in Light of Documents of Section II of the Polish General Staff), Warsaw, Adiutor, 1998. Tadeusz A. Olszański, "Akcja Łom" ("Operation Crowbar"), Płaj: Almanach Karpacki, no. 21 (jesień [autumn] 2000). Dariusz Dąbrowski, "Rzeczpospolita Polska wobec kwestii Rusi Zakarpackiej (Podkarpackiej) 1938–1939" ("The Polish Republic and the Transcarpathian (Subcarpathian) Rus Question in 1938–39"), Europejskie Centrum Edukacyjne (European Educational Center), Toruń, 2007, . Bill Tarkulich, Additional Annexation of Eastern Slovakia by Hungary, 23–26 March 1939. Sources: Edward Chaszar: The Czechoslovak-Hungarian Border Dispute of 1938 Veress, Laura-Louis: Clear the Line – Hungary's Struggle to Leave the Axis During the Second World War League of Nations Archives, Chronology 1939: