A planned visit by U.S. trade negotiators to New Delhi from August 25-29 has been called off, a source said, delaying talks on a proposed trade agreement and dashing hopes of relief from additional U.

U.S. President Donald Trump has announced 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-US trade talks likely delayed amid 50% US tariffs on Indian goods; PM Modi vows no compromise on farmers' and cattle rearers' interests as bilateral trade grows.

Both India and the US have already held five rounds of negotiations, with the last round of talks held in Washington DC from July 14-18. The talks were stalled over disagreement on opening India's vast farm and dairy sectors and stopping Russian oil purchases.

Five rounds of talks have already taken place, with the sixth round originally planned from 25 to 29 August. However, according to media reports, an official source familiar with the matter, speaking on condition of anonymity,

Renowned economist and Columbia University Professor Jeffrey Sachs has strongly criticised the United States administration’s tariffs, terming them as pressure tactic on India.

The US said the the "historic relationship between the world’s largest democracy and the world’s oldest democracy is consequential and far-reaching".