Where India's defence relations with US, Russia stand amid S-400 purchase?

The major Indian-Russian deal that has irked the Americans the most is the one that involves the S-400 Triumf. An advanced surface-to-air missile system, S-400 Triumf can shoot down hostile aircraft and ballistic missiles. It has an estimated range of 250 kilometres and a possible upgrade is speculated to extend it to 400 kilometres. ET's Manu Pubby sheds light on India's defence relations with the United States and Russia amid the purchase uproar. (Text: ET Online)