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 has announced the US will send "top-of-the-line weapons" to Ukraine via Nato countries, while also threatening Russia with severe tariffs if a deal to end the war is not reached within 50 days.