WASHINGTON, July 25 (Reuters) - U.S. President Donald Trump is unlikely to follow through on his threat to place 100% tariffs on countries that buy Russian oil because it would worsen politically-damaging inflation pressures and his similar threat against buyers of Venezuelan oil has had limited success, especially in China.

Donald Trump’s threat to impose secondary sanctions on countries buying Russian oil is probably more symbolic than practical, leading oil analyst and senior fellow at the Carnegie Russia Eurasia Center,