Brazil is scrambling to avert punishing 50% U.S. tariffs in a week's time, but high level talks are stalled and U.S. companies are reluctant to confront U.S. President Donald Trump over the issue, officials and industry leaders say.

With Donald Trump's punitive tariffs against Brazil poised to take effect within days, Latin America's largest economy is bracing for a virtual embargo on its planes, grains, and crude oil.