US cautions India over buying S-400 missile defence system from Russia

The US is ready to help India's defence needs with the latest technologies and equipment, but New Delhi purchasing long-range S-400 missile defence system from Russia would limit cooperation, the Trump administration has cautioned. Noting that India has a historical dependence on Russian arms, a senior State Department official said what causes concern with the S-400 is that it effectively could limit India's ability "to increase our own interoperability".