Shawdesh Desk:  US President Donald Trump warned Tehran on Wednesday that sanctions would soon be “increased substantially,” as armed Iranian boats reportedly attempted to seize a British oil tanker in

Gulf waters. Trump’s sanctions warning — which he delivered via Twitter — came as French President Emmanuel Macron’s top diplomatic advisor met with Iran’s president, winding up a day of talks in Tehran aimed at saving a landmark  2015 nuclear deal.  The 2015 accord between Iran and world powers promised sanctions relief, economic benefits and an end to international isolation in return for stringent curbs on the Islamic republic’s nuclear program.

Tehran says it has lost patience with perceived inaction by European countries more than a year after Trump unilaterally pulled the US out of the agreement and started to impose punishing sanctions.  Tensions between Washington and Tehran have soared in recent weeks, with the United States blaming Iran for multiple attacks on tanker ships, and the Islamic republic shooting down an American surveillance drone. On Wednesday, armed Iranian boats attempted to seize a British oil tanker

but were driven off by a Royal Navy frigate, CNN reported.

The Iranians ordered the tanker, which was crossing into the Strait of Hormuz area, to change course and stop in Tehran’s nearby waters, CNN said, citing two American officials. A US aircraft shot video of the incident, which ended when the HMS Montrose — which was escorting the tanker — trained its guns on the boats and successfully warned them to back off, the channel said. Iran’s President Hassan Rouhani had warned Britain of unspecified “consequences” on Wednesday over the detention of one of the country’s oil tankers off Gibraltar. The Grace 1 tanker was halted last week by police and customs officers in Gibraltar — a British overseas territory on Spain’s southern tip— with the aid of a detachment of British Royal Marines.

Iran condemned the detention as an “illegal interception,” but Gibraltar officials said that the cargo was believed to be destined for Syria, which is subject to European sanctions. Macron’s envoy Emmanuel Bonne met with Rouhani on Wednesday, who said that Tehran had “completely kept the path of diplomacy and talks open,” according to a statement from his office. He called on other parties to the nuclear deal to “completely implement their commitments” to keep it alive. Bonne also met Rear-Admiral Ali Shamkhani, the secretary of Iran’s Supreme National Security Council, and Foreign Minister Mohammad Javad Zarif. His mission was “to try and open the discussion space to avoid an uncontrolled escalation, or even an accident,” according to French Foreign Minister Jean-Yves Le Drian. Before meeting with Bonne, Zarif said “negotiations are never possible under pressure,” in reference to US sanctions against Iran. Pointing to the US withdrawal from the nuclear deal, he added that the Europeans “must solve that problem.”