President Donald Trump signed an executive order Wednesday to place an additional 25% tariff on India for its purchases of Russian oil, bringing the combined tariffs imposed by the United States on its ally to 50%.

India, which now faces among the highest tariff rates imposed by the US, called the levy "unjustified and unreasonable".

Tariffs on Indian exports to the United States will surge to 50 percent by late August, as part of an effort by President Trump to pressure Russia into resolving its war in Ukraine.