A stock market index of Indian IT firms, the Nifty IT Index (.NIFTYIT), has fallen by more than a fifth this year while the benchmark NSE Nifty (.NSEI) has been flat as weaker global demand and a shift towards AI pressures the industry.

Trump, who has previously denounced India as a “tariff king”, blamed New Delhi’s purchases of Russian weapons and oil for the additional rate, which puts at risk India’s largest export market, worth $87bn in the year to the end of March.

The Indian prime minister has said his country "is ready" to react to President Donald Trump's additional 25 percent levy on goods entering the U.S.