"India is not only buying massive amounts of Russian Oil, they are then, for much of the Oil purchased, selling it on the Open Market for big profits. They don’t care how many people in Ukraine are being killed by the Russian War Machine," Trump said in a post on Truth Social.

"Because of this, I will be substantially raising the Tariff paid by India to the USA."

He did not elaborate on what the tariff would be.

India’s trade ministry did not immediately respond to a request for comment.

Trump last week said he would impose a 25% tariff on goods imported from India and added that the world s fifth-largest economy would also face an unspecified penalty but gave no details.

Over the weekend, two Indian government sources told Reuters that India will keep purchasing oil from Russia despite Trump s threats. The sources did not wish to be identified due to the sensitivity of the matter.

A top aide to President Donald Trump on Sunday accused India of effectively financing Russia s war in Ukraine by purchasing oil from Moscow, after the U.S. leader escalated pressure on New Delhi to stop buying Russian oil.

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"What he (Trump) said very clearly is that it is not acceptable for India to continue financing this war by purchasing the oil from Russia," said Stephen Miller, deputy chief of staff at the White House and one of Trump s most influential aides.

Miller s criticism was some of the strongest yet by the Trump administration about one of the United States  major partners in the Indo-Pacific.

"People will be shocked to learn that India is basically tied with China in purchasing Russian oil. That s an astonishing fact," Miller said on Fox News  "Sunday Morning Futures."

The Indian Embassy in Washington did not immediately respond to a request for comment. Indian government sources told Reuters on Saturday that New Delhi will keep purchasing oil from Moscow despite U.S. threats.

A 25% tariff on Indian products went into effect on Friday as a result of its purchase of military equipment and energy from Russia. Trump has also threatened 100% tariffs on U.S. imports from countries that buy Russian oil unless Moscow reaches a major peace deal with Ukraine.

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Miller tempered his criticism by noting Trump s relationship with Indian Prime Minister Narendra Modi, which he described as "tremendous."