Goa, Aug. 5 -- Tensions between India and the United States flared up again on Tuesday after former US President Donald Trump warned he would "very substantially" raise tariffs on Indian imports within the next 24 hours. His reason: India's continued purchase of oil from Russia.

Speaking to CNBC, Trump said, "India has not been a good trading partner. They do a lot of business with us, but we don't do business with them. So we settled on 25 percent, but I think I'm going to raise that very substantially because they're buying Russian oil."

Just a day earlier, Trump had accused India of profiting from the re-export of Russian oil and vowed to ramp up trade penalties.

India swiftly pushed back, criticising both the US and the European Un...