He won a bronze medal in the half-middleweight (‍–‍81 kg) division at the 2004 Summer Olympics, despite breaking his arm fighting the semifinal.

After that, Nossov made an attempt to participate in the primaries of United Russia and to be nominated as a Deputy from this party, but his application was canceled due to membership in the LDPR.

[6][7] On 13 April, Nossov was expelled from the LDPR for "loss of connection with the party", fascination with his own PR and the creation of a "personal guard" under the guise of the "Anti-dealer" movement.

[11] As a result, Dmitri Nossov was nominated by the Communist party in the Divnogorsk single-member constituency of Krasnoyarsk Krai.

Is a member of the movement "Anti-Dealer", which is fighting drugs[16] In the State Duma, he created and headed an inter-factional group to combat lobbying in socially important bills, which included representatives of all parliamentary factions.