Unequal treatment reflects a cold combination of political and economic calculations. United States President Donald Trump has threatened to slap new sanctions on Russia and secondary sanctions on countries that buy Moscow's crude in efforts to end the Russia-Ukraine war. While Trump imposed an additional 25 percent tariff earlier this month to a total of 50 percent on India's goods, citing its continued imports of Russian oil, he has not instigated similar punitive actions against China, the largest buyer of Russian energy.