In 1918 Tchaikovsky was one of the founders of the “Union of the reconstruction of Russia,” an anti-Bolshevik organization of the left parties of Moscow. He was also elected member of the Ufa directorate. On his way to Siberia, he came to Vyatka, where he took the lead in an insurrection against the Bolsheviks and entered into negotiations with the Allied force at Archangel. He took part in the coup d'état of August 2 at Archangel and became president of the Supreme Administrative Board of the North Region. After the break-up of a conspiracy of monarchist officers, he organized the Provisional Government of the Northern Region under his own leadership. Tchaikovsky was sent by his government to Paris, where he represented the interests of the North Region before the Versailles Conference. He was a member of the “Russian Political Delegation” in Paris until its dissolution in February 1921.