The media has always been a tool for conducting propaganda activities. Not infrequently, especially in extreme situations, they were used to wage open wars aimed at promoting specific political views or arguments. Due to the enormous influence of the media on society, all such battles had an impact on the security of the state. If the dispute was purely regional, the effects of the press war were limited, and when the press dispute crossed national borders, its consequences were much greater - from the undermining of authority to international stigmatization. The Polish-Ukrainian media dispute that broke out over the repressive actions undertaken in connection with the sabotages carried out by Ukrainian nationalists in the summer months of 1930 in Eastern Lesser Poland was of great importance for the security of the Second Polish Republic. In the first phase, it contributed to the deterioration of already not the best Polish-Ukrainian relations in the Polish state. In the second turn, i.e. after the launch of a slanderous campaign against Poland in the international arena, it finally led to the League of Nations, under the pressure of public opinion and many influential politicians, accepting nine complaints against Poland. This resulted in over a year of proceeding with the case, which damaged Poland's authority in the international arena and perpetuated the unfavorable image of the Republic of Poland in many countries.