India and Russia are expected to ink a Five Billion Dollar S-400 Missile Deal at the 19th India-Russia Annual Bilateral Summit that begins in New Delhi today. Russian President Vladimir Putin who will be arriving in India today on a two-day visit is expected to oversee the sale of S-400 air defence missile systems. Defence Minister Nirmala Sitharaman has reiterated that the S-400 Air Defence Missile Deal will go ahead notwithstanding the US sanctions on military transactions with Moscow. If the deal does go ahead, India will invite the possibility of sanctions from the United States. Besides the missile deal, Putin and PM Modi will discuss the issue of security challenges in the Afpak region and the threat of terrorism that emanates from Pakistan.