The Japanese companies are Inpex, Itochu, Japan Petroleum Exploration, Marubeni and Itochu Oil Exploration subsidiary CIECO.

Inpex said the MoU was signed on Saturday in St Petersburg, Russia, and would centre on discussions on the foundations of a joint project company as well as joint LNG marketing in Japan "which would contribute to the realisation of the Vladivostok LNG project".

"Realisation of this project is considered to be very important for the stable LNG supply to not only Japan but also to the other Asian countries, and will contribute to the diversification of Russia’s gas (LNG) export sources," said Inpex.