The film ‘On the Other Shore’ takes place in 1925. The Belarusian People's Republic (BPR) independence was proclaimed after the Russian Empire's dissolution in 1918.
However, both Poland and Soviet Russia claimed Belarusian territory. As a result of the war between them, the Treaty of Riga, (1921) gave Poland the western part of Belarus, and the eastern part went to Moscow.
Then Belarusian territory had been existing precisely within these borders for 18 years. And in 1939, when Joseph Stalin and Adolf Hitler took turns attacking Poland, unleashing World War II, Western Belarus was annexed to the BSSR. These events became the context of the new film made by the propaganda of the Lukashenko regime.
The 'Zerkalo.io' team has analyzed its historical accuracy.