India, Aug. 27 -- US President Donald Trump's additional 25% tariff on Indian exports to the United States took effect on Wednesday, raising duty on some shipments to as much as 50%-the highest globally and on a par with Brazil and Lesotho.

Here is a look at why the additional tariff was imposed, and what it means for India.

India and the US have held five rounds of discussions since April to clinch a trade agreement, but differences over the opening up of India's vast farm and dairy sectors, and its purchases of Russian oil, led to a breakdown of talks. Officials on both sides also blamed political misjudgment and missed signals for the collapse of the talks.

The US announced a 25% tariff in July on Indian imports, which took effect o...