It is a record of the radio exchange between a Royal Navy and the frigate and Iranian forces, moments before a British-flagged oil tanker was seized in the Gulf.
In the record, the alleged Iranian ship tells HMS Montrose that it wants to inspect the tanker for safety reasons.  The Stena Impero was entered by Iranian authorities on Friday.
The Iranian Foreign Minister has asked Iran to reverse the "illegal" seizure of the tanker, the Stena Impero ̵
HMS Montrose identifies in the record obtained from the British maritime safety firm Dryad Global. If you operate transit traffic on a recognized international road, your transit traffic may not be affected under international law, […]. disabled, disabled or disabled attempting to get into the tanker
On Friday, the Stena Impero was seized by the Iranian Revolutionary Guard in the Strait of Hormuz, an important shipping route in the Gulf.
Tehran said the vessel was "violating international maritime rules."
The video released by the Fars news agency, the Iranian Revolutionary Guard, on Saturday shows the moment the tanker was raided.
It shows masked forces operating dropping ropes from a helicopter onto the ship after it was surrounded by high-speed ships.
HMS Montrose was alerted, but it was too far away for the Stop seizure.
The state news agency IRNA stated that the tanker was captured after colliding with a fishing boat and unresponsive to calls from smaller ships.
Secretary of State Jeremy Hunt, however, said that it was seized in the waters of Oman in "clear violation of international law" and then forced to sail to Iran.
The tanker owner, Stena Bulk, said they complied with the regulations and were in international waters.
They asked for entry into the port of Bandar Abbas to visit crew members from India, Russia, Latvia and the Philippines who are in good health.
Stena Impero was seized two weeks after Royal Marines seized Iranian tanker Grace 1 off Gibraltar for shipping oil to Syria against EU sanctions.
Hunt said Grace 1 had been arrested legally, but Iran Englisch: www.mjfriendship.de/en/index.php?op…80&Itemid=58 On Saturday, Hunt said it was "piracy" and threatened to seize a British oil tanker in retaliation. The situation on the agenda, "but he added that" nothing could be further from the truth. "
Ministers held Cobra emergency sessions, and a high-ranking Iranian diplomat was called to the Foreign Office.
Mr. Hunt said MPs would be updated on Monday.
"Our priority remains to find a way to de-escalate the situation, "he said.
The government advises British shipping to stay away from the region.
What did Iran say?
The Iranian Foreign Minister Javad Zarif has tweeted that Britain must "stop being part of #EconomicTerrorism of the US" 9659004] He said Iran guarantees the sic the Gulf and Strait of Hormuz and insisted on complying with international maritime rules.
Abbasali Kadkhodaei, spokesman for the State Watchdog of the Guardian Council, said on Twitter that "the law of retribution is a recognized concept in international law".
What is it? Background?
The recent developments are in the context of worsening relations between Iran and the United Kingdom and the United States.
Tensions between the US and Iran have increased since April, when the US tightened the sanctions they imposed on Iran unilateral withdrawal from a 2015 nuclear deal.
The US has been attacking Iran since May Tankers that denies Tehran. On Friday, the US claimed to have destroyed an Iranian drone in the Gulf.
The British government has continued to support the agreement, which restricts Iran's nuclear activities in return for the lifting of sanctions.
The British, however, The decision to seize the Iranian tanker Grace 1 earlier this month made Iran angry.
Last week, Iranian boats attempted to obstruct a British oil tanker in the area before being warned by HMS Montrose. Iran denied seizing the ship.
A White House National Security Council spokesman said Friday's incident was the second time in over a week that Britain had been "the target of escalating violence" by Iran.
And the US Central Command said it was developing a multinational maritime operation in response to the situation.
The Pentagon said US troops would be sent to Saudi Arabia to defend American interests in the region from "emerging credible threats."
France, Germany and the European Union called on the Iranian authorities to release the Stena Impero quickly.
The EU Foreign Ministry, which represents 28 Member States, expressed "deep concern".
How & # 39; British "Is the Tanker?
Ships must run the flag of a nation-state," explains Richard Meade, chief editor of Lloyd's maritime intelligence publication List Crew or its cargo, he says.
The Stena Impero is Swedish owned and the Indians, Russians, Latvians and Filipinos on board.
But it is the British flag that is symbolically important, he says. "Historically, this means that the UK owes protection to the ship."
"The United Kingdom has political responsibility for everything that is marked, so it is far more serious than having a British captain on board by accident."
He says that this has implications for trade in the region However, it has warned that if the international community sees the Strait of Hormuz as a dangerous place, it could create a "very different" scenario.
The seizure of a British flagged tanker in Omani waters, which is empty and entering a Saudi port, marks a serious escalation in a whole catalog of recent Gulf events.
The mysterious dismantling of tankers, the shooting down of drones from both the US and Iran, and the imminent capture of another British flagged tanker a few days ago.
Britain wants its response to happen for two reasons: measured and multinational.
trying to send a robust message to Iran that this action is unacceptable not only for Britain, but also for the rest of the world, but not so robust that it is part of an avoidable US military strike.
This has become a highly volatile situation where not everyone believes in diplomacy. There are some people in Washington who are striving for an increasingly tough line with Iran.
And there are people in Iran, especially in the Revolutionary Guards Corps and the Security Apparatus, who are quite ready to push it to the last moment on the brink of conflict, but likely to stay close to it.