US president says he is considering restarting naval escorts in strait of Hormuz in attempt to end Iranian blockade

• Middle East crisis – live updates

Donald Trump has said the ceasefire with Iran is on “life support” and that he is considering restarting US navy military escorts of ships through the strait of Hormuz in an attempt to end the Iranian blockade of the vital waterway.

The US president dismissed Iran’s peace proposals as stupid, and denied he was under any domestic pressure to reach a deal.

Riyadh told White House it would deny access for operation to provide tankers military escort through strait of Hormuz

• Middle East crisis – live updates

A refusal by Saudi Arabia to allow the US to use its bases and airspace to provide a military escort for oil tankers passing through the strait of Hormuz lay behind Donald Trump’s decision to shelve the plan days after it had been launched.

Riyadh told the White House it would not allow its Prince Sultan airbase to be used to mount the operation billed as Project Freedom, which the US presented as the successor to the bombing campaign called Operation Epic Fury.

War has combined with battered economy to leave Tehran wondering how hardline it can afford to be

Iran may not be choking like a stuffed pig as Donald Trump predicted, but its economy is in serious difficulty as a combination of a massive war-damages bill, inflation, currency devaluation, unemployment and a contraction in oil revenues combine to leave the political elite worrying how hardline they can afford to be with their US negotiators. One estimate circulating in Iran’s media suggests the damage to the economy from the US-Israeli attacks is nine times the value of the Iranian budget last year.

The UN Development Programme has estimated that 4.1 million more Iranians could fall into poverty.

Attendance at European Political Community meeting in Yerevan seen as part of effort to build ties after US rupture

Canada is to become the first non-European country to attend a meeting of the European Political Community when the prime minister, Mark Carney, joins Monday’s summit of the 48-plus nation grouping in Yerevan, Armenia.

Carney has said he is determined to build a new network of trade and diplomatic alliances after the loss of US markets under Donald Trump. His presence will also represent a show of western support for Armenia in its efforts to distance itself from Russia at a time when Washington’s approach to Moscow’s opponents, such as Ukraine, is at best ambiguous. Canadian diplomats have rejected suggestions Ottawa might seek EU membership.

Cross-party group says closure of humanitarian unit will undermine monitoring of legal violations and arms exports

MPs have expressed alarm at the closure of the Foreign Office’s international humanitarian law unit, warning it “will impair the UK’s ability to anticipate, assess and respond to serious violations of international law across multiple contexts”.

News of the closure, revealed by the Guardian, was raised with Keir Starmer at prime minister’s questions this week by the independent MP for Dewsbury and Batley, Iqbal Mohamed. Starmer said the work would be undertaken by another team as part of a restructuring.

Mojtaba Khamenei says Tehran will eliminate ‘enemy’s abuses of the waterway’ and guard its nuclear and missile programmes

• US politics live – latest updates

Iran’s supreme leader has broken his recent silence with a defiant statement hailing Iran’s control over shipping in the strait of Hormuz and vowing to guard the country’s nuclear and missile programmes.

“Today, two months after the largest military deployment and aggression by the world’s bullies in the region, and the United States’ disgraceful defeat in its plans, a new chapter is unfolding for the Persian Gulf and the strait of Hormuz,” Mojtaba Khamenei said in a statement read by a state television anchor.

Defection is damaging to Saudi Arabia’s prestige – and could strengthen the US hand in the region

The United Arab Emirates’ decision to walk out of Opec is a political as much as business decision, and will reignite the simmering rows between the UAE and Saudi Arabia – which had been covered up by their shared anger with Iran over its attacks on the Gulf states since the start of the US-Israel war on Tehran.

In the short term, leaving the oil producing cartel it joined in 1967 gives the UAE the freedom to respond quickly to a long-term prospect of constrained supplies, and to maximise profit. But it is a decision the UAE has considered before, as UAE and Saudi tensions over production quotas have been longstanding.

Exclusive: Officials warn department will also lose access to database of 26,000 verified incidents due to cuts

The Foreign Office unit tracking potential breaches of international law by Israel in Gaza and more recently Lebanon has been closed because of cuts within the department, the Guardian can reveal.

The decision to shut the international humanitarian law cell follows a review by Olly Robbins, the permanent secretary at the Foreign Office dismissed last week by the prime minister over the Peter Mandelson scandal.

Iran’s goal is to maintain chokehold on the global economy, even as some say it could run out of oil storage by Sunday

• Middle East crisis – live updates
  

Donald Trump’s indefinite shelving of the plan to bomb Iran’s bridges and power stations on Tuesday night is being widely described as leaving the conflict in limbo, but that is anything but the truth.

Pakistan insists the prospect of talks in Islamabad has not evaporated, and positive messages are still being exchanged, but in the meantime the site of kinetic activity has switched from land to sea.

US president’s contradictory statements only make Tehran more wary of anything but the most watertight deal

Donald Trump’s blend of threats and hubristic commentary, often casually dismissive of Iran, has, as much as the continuation of the US naval blockade of Iranian ports, been a key stumbling block to restarting peace talks between the two countries under Pakistan’s mediation in Islamabad.

However much the Iranian foreign ministry insists it will not respond to every social media utterance issued by the US president on Iran, and sometimes there are as many as seven a day, Tehran cannot ignore them all, even if they contradict what the Iranians are being told in private about Trump’s true intentions.

US president’s unreliable style sows diplomatic confusion but leaves Tehran clear on strategic value of strait of Hormuz

Donald Trump’s decision to send US officials to Islamabad for further talks on Monday with Iran just 24 hours after Iran once again closed the strait of Hormuz will signal to Tehran that the strategic waterway remains a bargaining asset beyond parallel.

It will also confirm in Iran’s eyes that the US president’s chaotic approach to diplomacy doubles the need for Tehran to act calmly and strategically – two competencies it believes he totally lacks.

US president’s desperation for war to end has seen him trying to speed through a process he does not fully control

A set of mismanaged and premature media announcements by Donald Trump and Tehran has led to the collapse of progress towards a peace settlement between Iran and the US.

The recent missteps ended with Iran saying it would reinstate a complete block on the movement of commercial shipping through the strait of Hormuz and that it would not allow any of its stockpile of highly enriched uranium to be exported out of the country.