Which Rainer Maria Rilke work was inspired by his trips to Russia?

The work inspired by Rainer Maria Rilke's travels to Russia is the three-part poem cycle titled Das Stunden-Buch (1905; The Book of Hours), written between 1899 and 1903.1

Rilke visited Russia in 1899 and 1900 with his companion Lou Andreas-Salomé, who introduced him to the country. He viewed Russia as an ideal symbol of his inner reality, describing it as having an elemental, religiously moving quality that represented a harmony of "God," "human community," and "nature". Rilke later stated that the poetic response evoked by these trips marked the true beginning of his serious work. In The Book of Hours, the poet adopts the persona of a young monk who addresses God through a series of prayers, reflecting the spiritual and artistic awakening he experienced during his time in Russia.21