Brushing aside US threats of sanctions, India and Russia on Friday concluded a deal for supply of S-400 Triumf long-range surface-to-air missile system giving a substantial boost to air Defence capabilities of the Indian Air Force.

The deal was concluded during the 19th India-Russia Annual Bilateral Summit between Prime Minister Narendra Modi and Russian President Vladimir Putin, though both the leaders made no mention of it in their statement to the media, apparently in view of the sensitivities involving the US that has been pressing India not to go ahead with the deal. Nor was the missile contract part of the signing ceremony for eight deals inked by the two sides in the presence of the two leaders covering areas of space cooperation, railways, nuclear cooperation, fertilisers and MSME.