He started acting in small roles in films. In 1994, he received an offer to try his hand in sports management. As a child Dyachenko loved hockey, he immediately agreed to work as an agent of the Russian hockey players. In 1998, Alexander left his job and moved to the U.S. where he received an actor’s education, training in Los Angeles under the teacher Milton Katselos. He acted on stage in Chicago.

His acting career in Russia began with the film Brother 2. In the film, he played the twin brothers Dmitry and Konstantin Gromov. He was cast in a number of Russian films and serials. From his youth Dyachenko has also been a musician; composing, arranging and performing on the guitar and singing. He has recorded some of his songs in a Chicago studio with well-known musicians. In 2012, Alexander, together with drummer Boris Lifschits, created a musical project Antigo.