Washington: The US has ruled out giving any exemption from its punitive sanctions to countries, including India, for buying oil from Iran, saying America's maximum pressure campaign was working and the Trump administration remains "unwavering" in its tough policy on Tehran.

US President Trump last month refused to give waivers to countries like India from buying oil from Iran, in an attempt to reduce Iran's oil exports to zero. The US on Tuesday reiterated its position after media reports from New Delhi, quoting unnamed government officials, said that India was looking at ways to resume oil imports from Iran despite the US sanctions.