Russian news reports say Moscow has signed a $1 billion deal with India to upgrade more than 60 MIG-29 jet fighters it had previously sold to New Delhi.
The reports Tuesday quote sources in Russia's defense manufacturing sector as saying a five-year contract calls for Russia to install new radars, weapons control systems and improved engines.
The reports say the upgrade will extend the operational service of the planes by 15 years.
Russia has aggressively sought to expand arms sales on the world market, and is currently refurbishing a Soviet-era aircraft carrier set for sale to India in 2011. A cost dispute for the refurbishment was reported settled last month.
Under the deal, the 45,000 ton Admiral Gorshkov is undergoing a more than $1 billion dollar upgrade before delivery to New Delhi.
Some information for this report was provided by AFP, AP and Reuters.