Russian President Vladimir Putin has left for Russia after  wrapping up a two-day visit to India. India and Russia  reportedly inked a $5 billion deal to procure Moscow's most advanced air defence system, the S-400 Triumf, risking US sanctions. Mr Putin arrived Thursday and was greeted by Foreign Minister Sushma Swaraj at the airport and welcomed by PM Modi at his residence.

India wants S-400 missile systems from Russia to change the strategic balance in the subcontinent. The long-range missile systems will tighten India's air-defence capabilities along the 4,000-km-long India-China border. The US could impose sanctions using the Countering America's Adversaries through Sanctions Act or CAATSA legislation, which deals primarily with countries having "significant transactions" with Russia, North Korea or Iran.

India is also planning on acquiring 4 Krivak-class frigates from Russia, two of which will be built in India, which will be a $2.5 billion deal.

Mr Putin and PM Modi are also set to discuss key regional and global issues, including US sanctions on import of Iranian crude oil. Along with the S-400 Triumf and Krivak deals, the bilateral summit will have the world leaders sign around 20 agreements.

Here are the highlights of Vladimir Putin, PM Narendra Modi's bilateral summit today: