Iran's ambassador to Venezuela, Hojat Soltani, insisted in a tweet that "the ships are not Iranian" while calling the claim about the seizures "another lie and psychological warfare from the propaganda machine of the US."

Washington's high-seas score stems from a July court complaint demanding the four tankers in question "forfeit all petroleum-product cargo" due to its having been shipped by the Islamic Revolutionary Guard Corps, according to the statement.

The Trump administration has leveled a bewildering array of sanctions against Iran, flooded the Persian Gulf with US military assets, and offered millions of dollars in bribes to Iranian ship captains to deliver their oil tankers into the hands of Uncle Sam.

Trump confirmed in a press conference on Friday that the Iranian cargo had been diverted to Houston, though he demurred when asked what would be done with the ships once they arrived. "We'll be announcing," he told reporters.

Iran's Ambassador to Venezuela, Hojat Soltani, further stated that Tehran would retaliate against any hostile actions directed against its ships and Iran's legal right to ship its goods.

The Marine Traffic service shows that all four vessels presumably seized by the US have not updated their positions in the tracking system since May or June, with most of them sailing under the Liberian flag.

However, the media claims that the tankers were privately owned and allegedly hired by Iran for the job. The Wall Street Journal claims they were originally a part of a larger flotilla allegedly sailing towards Venezuela and escorted by an Iranian Navy ship, but these four peeled off from the group at some point.

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European foreign ministers have agreed to move toward sanctions on Alexander Lukashenko's regime, after reports of the systematic abuse and torture of Belarusians swept up in the brutal crackdown on protests.

A diplomatic source said the EU's 27 foreign ministers had agreed that individuals responsible for the falsification of Sunday's presidential elections and subsequent violence against protesters should face asset freezes and travel bans into the bloc.

Officials will now be charged with drawing up a list of names for a legal agreement, which could happen in late August or September. "It was a surprising consensus," the diplomat said, while pointing out the 27 still had to reach consensus on the names.

© Provided by The Guardian Photograph: Tomasz Jastrzębowski/Rex/Shutterstock

The emergency video meeting on Friday was called to discuss the disputed elections in Belarus, after a string of EU countries called for action against those responsible for the violence and arbitrary detention of protesters.

Ahead of the meeting Poland, the Czech Republic, Estonia, Latvia, Lithuania and Denmark had called for "restrictive measures against officials" responsible for the election result, which gave Lukashenko 80% of the vote following a contest the EU said was "neither free nor fair". Germany, Austria and Sweden had also voiced support for sanctions.

"We need additional sanctions against those who violated democratic values or abused human rights in Belarus," the head of the EU executive, Ursula von der Leyen, tweeted on Friday. "I am confident today's EU foreign ministers' discussion will demonstrate our strong support for the rights of the people in Belarus to fundamental freedoms & democracy."

The German foreign minister, Heiko Maas, said. "The brutality and the detention of peaceful protesters and journalists in Belarus isn't acceptable in the Europe of the 21st century. This is why we have to increase the pressure on those in power there."

EU sanctions must be agreed unanimously.

Hungary was considered the main obstacle to EU action after the country's prime minister, Viktor Orbán, visited Minsk in June and called for existing EU sanctions to be dropped.

The country did voice caution over new sanctions, as did Austria and Greece, but they did not oppose the political decision to move in that direction.

Budapest had already backed an EU statement on Tuesday that threatened sanctions against those "responsible for the observed violence, unjustified arrests and falsification of election results". Following talks with the Latvian foreign minister, Edgars Rinkēvičs, his Hungarian counterpart, Péter Szijjártó, said on Thursday that the two countries shared the same assessment of the situation.

EU sources suggested Hungary could exert influence in narrowing the number of individuals on the sanctions list.

The EU will also explore new funds to support civil society activists in Belarus, and a fact-finding mission to help mediate between the government and opposition.

The British government has not revealed if it supports sanctions against Belarus, but under the terms of the Brexit transition the UK would have to enforce any EU measures that came into force before the end of the year.

The foreign office minister Wendy Morton described the violence as "appalling" and called on the Belarusian authorities to release "all those unjustly detained" and engage in dialogue with the opposition.

An EU spokesperson for foreign affairs and security said the bloc was "regularly in touch with it likeminded partners", including the UK on shared concerns and priorities, but added: "It remains to be seen if there will be a specific contact after [Friday's foreign ministers] video conference."

EU foreign ministers are also expected to discuss how the EU could mediate between Lukashenko and protesters. Poland and the three Baltic states have called on the autocrat to "immediately initiate a dialogue with the Belarusian people".

The EU lifted most sanctions against Belarus in 2016 as it sought a rapprochement with Lukashenko, who has ruled the country with an iron fist since 1994.

The decision to ease sanctions followed the release of political prisoners and a downturn in Minsk's relations with the Kremlin, but one former presidential candidate, Andrei Sannikov, called it "a grave mistake".

The EU retains a ban on arms sales and sanctions on four individuals linked to the unsolved disappearances of opposition politicians, a journalist and businessman in 1999-2000.

Belarus is not the only crisis at the EU's border vying for attention. Ministers will discuss rising tensions in the eastern Mediterranean between Greece and Turkey and the political crisis in Lebanon following last week's catastrophic explosion.

France announced this week it was sending a naval frigate and two fighter jets to the eastern Mediterranean, amid a growing row between Athens and Ankara over offshore energy reserves.

Emmanuel Macron last month called for EU sanctions against Turkey over what he called "violations" of Greek and Cypriot sovereignty in their territorial waters. But that has met a cool response from Berlin, which has called for "de-escalation and solution-orientated dialogue". Brussels also stopped short of proposing sanctions in a recent statement on the "extremely worrying" situation.