Dos Santos (21-9) will play his debut match in the Russian promotion on May 20 against Yorgan De Castro (8-3).
Earlier, the Brazilian agreed to hold a boxing match against Kubrat Pulev at the Triller show, but the event was canceled.
Recall that the 38-year-old "Gypsy" was fired from the UFC at the beginning of last year after four defeats in a row.