"We have very little time left for deciding on the chief guest and the process will be completed soon," a source familiar with the development said.
India announced its intention to acquire S-400 'Triumf' surface-to-air missile systems in 2015. The contract worth $5.43 billion was signed during the visit of President Putin to India last year.
General Mattis has been the most steadfast champion in Trump's cabinet of the US-India defence relationship. If Trump chooses a more pliable successor, the Pentagon's attention could go off India.
>Putin's last-minute intervention with PM salvages $5.43 bn pact.
United States Defence Secretary Lloyd J Austin arrived in India on Friday on a three-day visit, aimed at further boosting bilateral defence and security ties in the wake of China's growing military assertiveness in the region including the Indo-Pacific.
America had postponed the much-awaited dialogue due to "unavoidable reasons" last month.
In a series of tweets -- in Russian and then in English -- on the eve of his visit to Russia, Modi said he looked forward to his meeting with Putin.
External Affairs Minister S Jaishankar said if 'you look at the totality of our ties and we will look at where we have strong economic synergies, where we have strong technology promptings, these are really based on the flow of talent.'
A US president graced the Republic Day parade in the first year of the Modi regime. Will another American prez turn up in the final year of the first Modi Sarkar?
Sources had earlier said Modi and Putin would also deliberate on impact of US sanctions on import of crude oil from Iran.
Modi said India and Russia have been friends for a long time and thanked Putin for inviting him for the first-ever informal meeting at Sochi.
Both India and Pakistan have announced that stretches would be developed in their respective areas.
Sources also said that India meets the criteria for a US sanctions waiver for procuring S-400 missile defence systems from Russia and the Trump administration has 'enough flexibility' on the issue.
Jaishankar said India will try to find common ground on trade issues during discussions with Pompeo.
Russia -- already India's biggest arms supplier from 2014-18, accounting for 58 per cent of India's defence imports -- eyes more, reports Ajai Shukla.
Putin, who was received by External Affairs Minister Sushma Swaraj on his arrival, went straight to Modi's official Lok Kalyan Marg residence where the two leaders had a one-on-one meeting.
The stagnation in US-Russia relations does not augur well for New Delhi's strategic interests, says Harsh V Pant and Raj Kumar Sharma.
"We have many relationships...they have a history. We will do what is in our national interest and part of that strategic partnership is the ability of each country to comprehend and appreciate the national interest of the other," Jaishankar said.
"It would be my hope that people understand why this particular transaction is important for us," the EAM said in Washington, DC.