President Donald Trump Wednesday warned Iran against further uranium enrichment but left open the possibility the US could lift sanctions to pave the way to a meeting with President Hassan Rouhani.

The United States will continue to impose sanctions on whoever purchases Iran's oil or conducts business with Iran's Revolutionary Guards and no oil waivers will be re-issued, a US official told Reuters on Sunday.

Iran accused the United States on Thursday of "childish behaviour" driven by fear after Washington imposed sanctions on its foreign minister, fanning tensions between two foes at loggerheads ...

The United States imposed sanctions on Thursday on 10 people and 13 groups in a Venezuelan food subsidy scheme that lined the pockets of President Nicolas Maduro ...

President Donald Trump accused Iran on Wednesday of secretly enriching uranium for a long time and warned that US sanctions will be increased soon, as the UN nuclear watchdog held an emergency meeting on Tehran's breach of a nuclear deal.

The US policy of maximum economic pressure on Tehran is working but the sanctions do not give Iran the right to breach its nuclear commitments, a senior US official said on Monday.

President Donald Trump on Tuesday threatened to attack Iran in retaliation for any strikes by Tehran "on anything American," after Iran said new US sanctions precluded any diplomacy and called the White House actions "mentally retarded."

Turkey said Monday it does not fear US sanctions over its decision to buy a Russian missile defence system that has frayed ties between the NATO allies.

India's Reliance Industries, operator of the world's largest oil refining complex, on Friday said in a statement it was not breaching US sanctions against Venezuela.

Iran will respond firmly to any Israeli naval action against its oil shipments, Iran's defence minister said on Wednesday, in comments that came a week after Israel's prime minister said its navy could act against Iranian oil "smuggling" to enforce US sanctions.

Iran hopes a new trade channel with Europe aimed at cushioning the blow of reimposed US sanctions will be working within weeks, its deputy foreign minister said on Wednesday.

Indian traders will export raw sugar to Iran for March and April delivery, five trade sources said, the first Indian sugar sales to Tehran in at least five years as Iran struggles to secure food supplies under sanctions imposed by the United States.