India's state-run oil refiners have halted Russian oil imports due to shrinking discounts and pressure from former US President Donald Trump's threats of tariffs and sanctions, shifting to Middle Eastern and African oil instead. The move comes as India is the world's third-largest oil importer and Russia's biggest buyer of seaborne crude, a vital revenue earner for Moscow. Indian Oil Corp, Hindustan Petroleum, Bharat Petroleum, and Mangalore Refinery Petrochemical Ltd have stopped buying Russian crude in the past week, amid a tariff row with the US. The Trump administration has imposed tariffs on Russian oil, leading to a halt in purchases by Indian refiners such as Adani Enterprises and Adani Ports.