As a member of the Kirov Opera, Diadkova toured internationally under company director Valery Gergiev.
She made her Metropolitan Opera debut in 1996 as Madelon in Andrea Chénier and performed the role of Marfa in The Tsar's Bride at La Scala in 1998.
She also appeared in four Metropolitan productions in 1998: Prince Igor, Ruslan and Lyudmila, Mazeppa and Betrothal in a Monastery.
[2] Her other notable roles include Ježibaba in a 2002 modernization of Rusalka and Azucena opposite Roberto Alagna.
[3] Diadkova lives in Luxembourg with her husband, a former singer with the Mariinsky Theatre, and their daughter.