Napoleon, in preparation for the French invasion of Russia in 1812, disregarded this alliance; he offered the duchy to the Swedish heir apparent Jean Bernadotte for his support.
Napoleon, valmistades aastal 1812 ette sissetungi Venemaale, eiras seda liitu; ta pakkus hertsogkonda ilmsele Rootsi troonipärijale Jean Bernadotte'ile tema toetuse eest.