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.

The president imposed tariffs on Japan, one of America’s closest allies, that would have been alarming just months ago. And markets went up.

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Many economists already believe it’s a matter of time before Americans start to see sticker shock from the tariffs President Donald Trump has enacted. That timeline could speed up even more if Trump follows through with his latest package of tariff threats slated to take effect in three weeks.

Investors over the past few weeks have countenanced a barrage of tariff threats as the Trump administration has ratcheted up the pressure on U.S. trade partners ahead of its Aug. 1 deal deadline.

President Donald Trump’s administration is preparing a new emergency declaration as a basis for tariffs on Brazil, people familiar with the matter say.