Russian President Vladimir Putin will seal a deal with Indian Prime Minister Narendra Modi during an upcoming visit to deliver Moscow's most advanced air defence system, the Kremlin said Thursday.

"An agreement on the delivery of S-400 'Triumph' anti-missile defence systems and other deals will be signed as a result of the talks," Russian news agencies quoted Putin aide Yuri Ushakov as saying, without specifying a timeframe.

Putin will meet Modi in the Indian state of Goa on Saturday on the sidelines of the BRICS Summit involving the leaders of Brazil, Russia, India, China and South Africa.

The Kremlin earlier this week said the talks with Modi would focus on "a wide range of matters of bilateral relations, especially trade and economic ties."

The S-400 is Russia's most modern air defence system and has been deployed to Syria, where Moscow is conducting a bombing campaign in support of long-time ally Syrian President Bashar al-Assad.

The system can track some 300 targets and shoot down around three dozen simultaneously over a range of several hundred kilometres.

India has signed a series of key defence deals under Modi as part of a $100 billion upgrade of its Soviet-era military hardware, making it an attractive proposition for arms exporters.

In September, after nearly a decade of discussions and setbacks, India signed a deal to acquire 36 French Rafale fighter jets for 7.9 billion euros ($8.8 billion) to bolster its military against an increasingly assertive China.

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