Russian Deputy Chief of Mission Roman Babushkin said today that all S-400 air defence missile systems will be delivered to India by 2025.
"The production of S-400 missiles to be delivered to India has started," he said.
External Affairs Minister S Jaishankar will visit Russia on March 22 and March 23 to attend a meeting of the Russia-Indian-China trilateral.
The S-400, an upgraded version of the S-300, had previously only been available to the Russian defence forces.
It is manufactured by Almaz-Antey and has been in service in Russia since 2007.