Iran’s response to Israeli attacks on its nuclear facilities is “self-defence” and a “matter of principle”, the Iranian ambassador to the UK has told Sky News.

Speaking exclusively to The World With Yalda Hakim, Seyed Ali Mousavi said the “barbaric Israeli regime” is “violating international law” – describing Israel’s actions in recent days as “an act of aggression against the Iranian people”.

The conflict between Israel and Iran – once played out in a series of proxy wars – has escalated in the past three days.

Follow Israel-Iran conflict live

On Friday morning, explosions hit Tehran as Israel carried out a major attack on its top army leaders, nuclear sites, and nuclear scientists.

Iran threatened “severe punishment” and quickly retaliated with a wave of missiles.

When questioned about whether Iran could continue fighting Israel, the Iranian ambassador told Yalda Hakim that “it is a matter of principle”.

He said: “This is about self-defence, there is no doubt about it.

“We are a responsible member state of the UN and we do all activities according to our international obligations.

“Any activities are only in the framework of self-defence.”

He added that his country would “do our best to preserve our territorial integrity”, and that “with the help of God”, Iran will “materialise endeavours concretely against our enemy – the Israeli regime”.

Mr Mousavi also told Hakim that Iran’s nuclear activities are “monitored”, and that recent comments by the International Atomic Energy Agency (IAEA) were “politically motivated”.

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The UN nuclear watchdog’s board of governors found Iran was not complying with its nuclear obligations for the first time in 20 years.

Iran said it has “always adhered” to the safeguarding obligations laid down by the watchdog.

Announcing Operation Rising Lion on Friday, Israeli Prime Minister Benjamin Netanyahu claimed Iran had recently taken steps to weaponise enriched uranium, which could be used to make nuclear weapons.

But Mr Mousavi stressed that Iran’s “peaceful activities” at its “nuclear fields” were only for the “generation of electricity, and other peaceful” things.

Iran was due to continue its round of negotiations with the US in Muscat – however, this was cancelled, given recent tensions.

The government is warning people not to travel to Israel under any circumstances, as the country’s missile exchange with Iran shows no sign of abating.

On Friday, the Foreign Office warned against “all but essential travel” to most of Israel.

The areas around Gaza, the West Bank and the Golan Heights were already classed as red zones, with warnings to avoid travel to these areas.

But the government has now updated the warning for the remainder of the country to red.

Follow live: Tehran and Israel exchange strikes

This puts Israel on the same level as Iran, and the change of advice is also likely to impact travel insurance.

However, with Israel’s airspace closed, it is unlikely many people will be attempting the journey, and Israel’s national airline El Al has announced it is cancelling flights to and from many European cities, as well as Tokyo and Moscow, until 23 June.

The change in travel advice comes after a second night of ballistic missile barrages from Iran following Israel’s attack in the early hours of Friday morning.

On Sunday morning, Israel’s health ministry said 12 people had been killed over the past day, taking the total since Friday to 15. It also said 385 people had arrived at hospital with injuries overnight.

Iran has not provided a total number of deaths or overall casualties, but has claimed dozens have been killed.

Iran’s health minister has said most of those injured and killed in Israeli strikes were civilians. According to comments carried by news agency IRNA, he said the majority were women and children.

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What is the UK doing?

The UK government is sending military assets, including fighter jets, to the Middle East.

While the prime minister would not confirm to reporters that UK forces could be used to defend Israel from future Iranian attacks, the chancellor told Sky News earlier that the government is “not ruling anything out”.

Speaking to Sky’s Sunday Morning With Trevor Phillips, Rachel Reeves said sending military assets to the Middle East “does not mean that we are at war”, and emphasised that “we have not been involved in these strikes or this conflict”.

“But we do have important assets in the region,” she continued. “And it is right that we send jets to protect them. And that’s what we’ve done. It’s a precautionary move, and at the same time, we are urging de-escalation.”

Pushed on the question of what the UK would do if Israel asked for support with its operations, the chancellor replied: “I’m not going to rule anything out at this stage. It’s a fast-moving situation, a very volatile situation. But we don’t want to see escalation.”

A helicopter carrying Hindu pilgrims has crashed in India, killing seven people on board.

The accident happened within minutes of the helicopter taking off, officials said, on what should have been a 10-minute flight.

The helicopter was flying to Guptkashi, a prominent Hindu pilgrimage site in the Himalayas, from Kedarnath temple town in the northern Indian state of Uttarakhand.

It comes three days after an Air India flight crashed less than a minute after taking off from Ahmedabad airport in northwestern India, killing at least 270 people.

The helicopter, which was operated by private helicopter service Aryan Aviation, went down in a forested area several miles from the Kedarnath pilgrimage route at around 5.30am local time.

Officials said the crash was believed to have been caused by poor weather conditions.

Authorities say they have launched a search and rescue operation and are expected to review operational protocols for flights in the region.

The dead include the pilot and pilgrims from the neighbouring state of Uttar Pradesh and western states of Maharashtra and Gujarat, according to officials. The bodies were badly burned in a fire that followed the crash, they said.

Tens of thousands of pilgrims visit Kedarnath, which is home to one of the four most sacred Hindu temple shrines, each summer. Many use helicopter services due to the difficult mountainous terrain.

Helicopter mishaps are not uncommon in the region, where sudden weather changes and high-altitude flying conditions can pose risks.

Earlier this month, a helicopter operating in the Kedarnath Valley made an emergency landing shortly after taking off on a highway due to a technical fault. The pilot was injured but all five passengers on board were unharmed.

In May, a helicopter crashed in Uttarkashi district, killing six people, including the pilot. One person survived.