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.

US President Donald Trump issued a sharp warning to Russia, suggesting that secondary sanctions may be imposed due to its ongoing involvement in the Ukraine war. Speaking to reporters at the White House before departing for Scotland,