The foreign ministers of Spain and Russia on Tuesday hit out at US sanctions policy against Iran and ultimatums they say are being imposed by Donald Trump's administration.

The deal had been unanimously endorsed by a United Nations Security Council resolution, making it legally binding.

On Monday, Washington reimposed its last tranche of sanctions -- punitive measures targeting the Iranian oil and financial sectors.

The Trump administration nevertheless gave eight countries temporary waivers, allowing them to continue to buy oil from Iran -- China, India, Turkey, Japan, South Korea, Taiwan, Italy and Greece.

But in general the US sanctions stipulate that to maintain access to the US market, countries and foreign companies must stop trading with Iran.

"Sanctions are absolutely illegitimate, they are are being imposed in flagrant violation of the UN Security Council's decision," Russian Foreign Minister Sergei Lavrov told reporters in Madrid.

"And the forms in which these measures are being declared and implemented cannot cause anything but deep disappointment.

"It is not acceptable in our age to pursue a policy based on ultimatums and unilateral demands." Spanish Foreign Minister Josep Borrell concurred, saying he rejected "any kind of position that resembles an ultimatum from anyone and also from the United States.

"This notion of 'you're either with me or against me' is of another era." Lavrov also once again rejected accusations of Russian interference in polls abroad, on the day of crucial US mid-term elections.

"All these accusations are false," he said.

"There is no intervention from Russia in today's elections.

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