The Modi-Putin summit is the biggest geopolitical event of the week. While the "special and privileged strategic partnership" covers everything from trade to space, defense remains the centerpiece, particularly the Russian S-400 Triumf air defense system. India is already in the process of acquiring five S-400 regiments under a $5.43 billion deal signed in 2018. Now, during this summit, new discussions are on the table for potentially purchasing five more S-400 squadrons. Russia's defense firm Rostec is offering to supply additional regiments and has also initiated talks for up to 50% technology transfer for the missiles and supporting systems, which would boost the 'Make in India' initiative