The article elucidates the endangerment to Poland's military security by the USSR in the interwar period of three sub-periods: 1921-1926, 1926-1935, and 1935-1939. The fragmentary sources of the undertaken research complexity are dispersed, secured in the Polish and foreign archives. In Poland, the reconnoiter of this topic began after the turn of 1989. Almost throughout the entire period under investigation, the Polish supreme State and military authorities assessed that the USSR (until December 30th, 1922, Russia) is the biggest threat to Poland's military security. In March 1939, they reconsidered this assessment focusing on Germany as the main threat to Poland's independence, mistakenly assuming that in the early period of the war, the USSR would remain neutral. The article analyzes, therefore, the Polish assessments of the USSR's sinister actions aimed at undermining the security of the Republic of Poland, and Polish counteractive decisions and safeguarding activities
The article presents the military relations between Poland and the Soviet Union in the years 1921-1939, from the end of the war between Poland and the Bolshevik Russia until the beginning of World War II. Its content has been divided into four subchapters, in the first of which the author analyzes the state of research on the topic in question and the state of preservation of sources in Polish and foreign archives. In the following subsections, the author presents the military relations between Poland and the USSR in three periods: in the years 1921-1926, 1926-1935 and 1935-1939. The last subsection is key to the undertaken research problem. It contains findings on the changes in the mutual military relations to the disadvantage of Poland, in connection with the rapid expansion and modernization of the Red Army and the difficulties of the Polish military intelligence in their assessment and difficulties in recognizing the reconstructed cooperation between the USSR and Germany.
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