Russia may bid to host the 2020 World Expo in one of its cities, the deputy minister of industry and trade, Stanislav Naumov, told a Russian government daily on Monday.

Naumov said mobility was chosen as the Russian exhibition's main theme.

"It would concern not only transport, but also information, social and other aspects of this notion," he told Rossiiskaya Gazeta.

Several Russian cities have already expressed their willingness to host the event, but the decision is yet to be officially announced.

The Russian official also said he was satisfied with the results of the 2010 Expo, held in Shanghai from May 1 to October 31.

The earliest allowed year to lodge a bid is 2011, and the latest is 2014. Cities from Australia, Brazil, China, Denmark, Thailand, Turkey, the United Arab Emirates and the United States have already indicated their willingness to host the Expo 2020.