The US economy will feel the pain if Trump goes ahead with his plan to whack countries buying Moscow’s oil with fresh tariffs on their goods.

"The key channel by which secondary tariffs on buyers of Russian energy could impact the global economy would be through the level of energy prices," says Kieran Tompkins from the consultancy Capital Economics. If the tariffs work, they will cut the flow of Russian oil and gas to global markets.

US president's statement comes days after he targeted India for buying oil and arms from Russia; he has imposed 25% tariffs on India, trade deal talks are on