MOSCOW, January 13 (RIA Novosti) - Shipbuilding contributes up to $7 billion to the annual portfolio of orders of Russia's state-run arms exporter Rosoboronexport, an executive at the government hi-tech corporation Rostekhnologii said Tuesday.

"This sum relates to the Rosoboronexport portfolio of orders. This is the maritime share of the portfolio of orders," Rostekhnologii First Deputy General Director Alexei Alyoshin said.

Russia doubled its annual arms exports to $8.5 billion last year compared to 2000, becoming the world's second-largest exporter of conventional weapons after the United States. Rosoboronexport's current arms exports portfolio totals $33 billion.

Russia exports arms to about 80 countries. India, China, Algeria, Vietnam and Indonesia remain key buyers of Russia's naval armaments.

India and China have purchased submarines, frigates and destroyers. Vietnam has ordered Svetlyak-class fast attack boats and frigates, while Indonesia will receive corvettes built in Russia in cooperation with Spanish firms.

Moscow plans to increase foreign weapon sales by 8-10% annually over the next three to four years.

The most popular types of weaponry bought from Russia are Sukhoi and MiG fighters, air defense systems, helicopters, battle tanks, armored personnel carriers, and infantry fighting vehicles.