LAGOS- Nigeria's state oil firm signed a memorandum of understanding with Russian oil company Lukoil for potential cooperation in oil production, trading and refining, Lukoil said on Thursday.

Mele Kyari, head of the Nigerian National Petroleum Corporation (NNPC), signed the memorandum during a visit to the Russian city of Sochi during a Russia-Africa Summit.

(Reporting by Libby George; Editing by Edmund Blair) ((Libby.George@thomsonreuters.com; +234 809 065 5059 ; Reuters Messaging: libby.george@thomsonreuters.com))