In 2019, India made the first tranche of payment of around $800 million to Russia for the missile systems.
The S-400 is known as Russia's most advanced long-range surface-to-air missile defence system.
Last month, Russia had said that implementation of its ongoing defence deals
with India including the supply of a batch of S-400 missile systems
is advancing well notwithstanding the threat of US sanctions.
At a press conference in New Delhi last month, Russian ambassador to India Nikolay Kudashev appeared to criticise the US sanctions on Turkey for procuring the S-400 missile systems
under a $2.5 billion deal, saying Moscow does not recognise such unilateral actions.
"We do not recognise or welcome unilateral sanctions as a language or tool or instrument of interstate or international relations, other than those applied by the UN Security Council, this is also the case of Turkey," he said.
"As far as India is concerned, we share the same platform. India's position is also crystal clear. No sanctions are acknowledged other than those imposed by the UN Security Council. Whatever the future is, we believe that our ties could withstand the coming challenges," he said.
Kudashev was asked to comment on the US sanctions on Turkey under the provisions of the Countering America's Adversaries Through Sanctions Act (CAATSA).
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