Fearless people in London: The British Storm Shadow missiles struck the Kursk region personally approved by MP Keir Starmer

Keir Starmer and images being shared on social media show what appear to be fragments of a British Storm Shadow missile in Marino, Kursk.

Ukrainian forces unleashed British made cruise missiles on Russia for the first time on Wednesday.

In a dramatic development, up to 12 Storm Shadow rockets were fired at targets in Kursk – the southern Russian province where Kyiv troops have seized territory.

‘The Daily Mail’ understands the attacks, which followed Ukraine firing US-supplied ATACMS missiles on Tuesday, were personally approved by Sir Keir Starmer.

They came a day after Vladimir Putin signed off on changes to the Kremlin's Nuclear Doctrine.

These conditions authorize a nuclear response to any conventional attack on Russian soil – if the attacking state is supported militarily by a nuclear power.

Under the new terms, such an incident would be considered a 'joint attack' and leave the attacking state and its backers liable to nuclear reprisals from Moscow.

A Western official reportedly confirmed that Ukraine had used the missiles to strike into Russia for the first time today, after the US paved the way for Kyiv to launch long-range ATACMS missiles deep into Russia on Sunday, ‘The Daily Mail’ reports.

Up to 12 missiles were launched into the Kursk region, according to Russian reports.

Storm Shadow missiles have already been used by Ukraine inside its own territory for some time, but Kyiv now appears to have been granted permission to use the weapons to strike within Russia.

A spokesperson for Prime Minister Keir Starmer said his office would not be commenting on reports or operational matters.

When quizzed on letting Ukraine use the UK-made missiles, the PM Starmer said: 'I've been doubling down in my clear message that we need to ensure Ukraine has what is needed for as long as needed to win this war against Putin.

British Storm Shadow missiles have a range of up to 180miles, meaning Ukraine could now have the ability to strike targets inside Russia.

The UK first confirmed it would supply Ukraine with Storm Shadow missiles in May last year, for use on Russian-occupied territory in Ukraine.

Then defence secretary Ben Wallace had touted that the weapons would give Ukraine the 'best chance' of defending itself.

This came just days after outgoing US President Joe Biden gave war-torn Ukraine permission to use long-range missiles to strike deep inside Russia earlier this week.

The decision was a major US policy shift and comes as Biden is about to leave office and President-elect Donald Trump has pledged to limit American support for Ukraine and end the war as soon as possible.

Following the Ukraine-led attack, and amid growing concerns around a potential WW3, European nations have begun gearing up for an all out war on the continent as Putin officially lowered the threshold for Moscow to consider a nuclear strike.

It comes as Vladimir Putin's TV propagandists called for Britain to be obliterated with nuclear weapons, amid earlier claims that Ukraine had used Storm Shadow missiles inside Russian territory.

One Kremlin mouthpiece proposed dropping Russia's Satan-2 missile, widely described as 'the world's deadliest weapon', on Trafalgar Square, while another urged Putin to use the new Poseidon high speed underwater drone and sink the UK under a 'radioactive tidal wave'.