Head of Russia's Rostec state conglomerate Sergei Chemezov attends a meeting with Russian President Vladimir Putin in Moscow, Russia July 22, 2019. Sputnik/Alexei Druzhinin/Kremlin via REUTERS/File Photo

DUBAI (Reuters) - India has made an advance payment of $800 million for Russia’s S-400 anti-aircraft missile systems, the head of Russian conglomerate Rostec Sergey Chemezov told reporters on Monday.

Chemezov said negotiations were underway and a contract with India will be completed in 2025.