In 1932 Kostoprav started to work in Mariupol Greek (Rumeika) newspaper Kolechtivistis [uk] as an executive editor and journalist.

His widow was informed that he died of sarcoma 23 July 1944 (this date was later repeated in his biographies, until the documents on his sentence and execution were published).

In 1930s he published his poems and short stories in Rumeika Greek in local almanacs and magazines Flogomitres Spithes,[3] Neotita [uk],[4][5] Neos Machitis, Pioneros and in the newspaper Kolechtivistis.

Kostoprav's short stories were included into the reading book for Mariupol Greek schools, edited by Amphiktyon Dimitriu [ru].

During his short career Kostoprav also contributed to translations from Russian, including two books of Chekhov's stories,[8][9] poems of Alexander Pushkin[10] and Agniya Barto's poetry for kids.