"Among the 21 countries surveyed, the largest drop in approval - from 57% to 27% - was seen in China, the Global Attitudes Project reveals.

Most respondents in almost all countries opposed US drone strikes.

Despite these numbers, confidence in Mr Obama remains high among US allies, especially in Europe.

"I think where you see the real disappointment is when you deal with specific policies," said Richard Wike, associate director of the Pew Global Attitudes Project.

He added that the survey showed big gaps between expectation levels and action over Mr Obama's policies on climate change and treatment of the Israeli-Palestinian conflict."