Russia is set to double its crude oil supply to earthquake-devastated Japan this year to some 18 million tons as a part of an energy aid package, top Russian energy official Igor Sechin said on Tuesday.

Russia is rolling out several proposals to help Japan, which is suffering from the world's worst nuclear crisis in a quarter of a century, including an offer to increase shipments of liquefied natural gas (LNG) and coal.

"In 2010, we supplied Japan with 9.1 million tons of crude oil and 3.5 million tons of oil products. This year, taking into account what had happened in Japan, we forecast doubling of crude oil deliveries to 18 million tons," Sechin told reporters.

He said a tanker with 100,000 tons of LNG had already been sent to Japan. Sechin earlier promised that Russia would supply its eastern neighbor with 200,000 tons of LNG.

According to an oil exports schedule, Russia is set to supply the Far East with 3.175 million tons of crude oil in the second quarter, compared with 3.7 million tons in January-March.

Russian Prime Minister Vladimir Putin last week set forward plans to send more gas and other energy resources to Japan, although analysts doubted this offer would be eagerly embraced by Russia's trading partners.

Russian gas monopoly Gazprom said on Monday it was ready to raise gas deliveries to Europe by 60 million m³ a day, which would allow the rerouting of LNG cargoes to Japan.

Sechin reiterated that Japanese companies were invited to take part in development of an Eastern Siberia gas field. He also said that Japan may join construction of a petrochemical plant, which is being built by Rosneft, Russia's top crude producer.