The leader of the Green Party of England and Wales, Polanski also called for the UK Government to scrap a £240 million deal with US firm Palantir and cut its reliance on nuclear weapons amid a wider review of defence strategy.

The intervention, in an article for The New Statesman , comes as European leaders are grappling with how to respond to Trump’s threats to hit his own allies with tariffs if he is not allowed to buy Greenland.

The US president said he would charge the UK, Denmark, Norway, Sweden, France, Germany, the Netherlands, and Finland a 10% tariff “on any and all goods” sent to the US from February 1, increasing to 25% from June 1, until a deal is reached over Greenland.

Trump has also not ruled out military action to achieve his aim of taking the territory, which is a semi-autonomous part of the Kingdom of Denmark. UK Prime Minister Keir Starmer claimed on Monday that Trump was not being genuine about the prospect of using military force to annex the island, and signalled Britain would not engage in a trade war over the dispute.

Polanski said the UK Government needed to review its security strategy, writing: “Suddenly, the idea that we might need to rethink our security structures doesn’t seem so naïve, while people like Nigel Farage who’ve spent years cosying up to Trump clearly aren’t the ones we should be listening to at this moment.”

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He went on: “When Trump says ‘one way or the other, we’re going to have Greenland’, we should sit up and listen.

“It’s now terrifyingly clear that betting our entire national security on being America’s poodle will simply not be a tenable situation for much longer. So the question is, what do we do about it?”

Polanski laid out four key areas:

First, he called for the UK to “disentangle our security apparatus from the USA so that we are genuinely independent”. He said this should include a plan to remove US bases from UK soil, and cancelling the £240m deal with Palatir.

Second, he called for the UK Trident nuclear weapons system, which “relies on the USA”, to be ditched “fast”.

Third, he called for a “genuine security review that takes into account the serious threats facing the UK today”. Polanski said this includes analysis of the impact of the climate crisis as “military figures are warning that the threats posed by the climate crisis dwarf the threat from other states”.

Fourth, the UK should strengthen relations with European allies and the Global South in order to “reduce our dependence on the US”.

He finished: “The first duty of a government is to keep its people safe. And in today’s unpredictable world, that won’t be achieved by clinging to outdated ideas about security, or cowering at Trump’s feet in the hopes that he will protect us.

“Instead it means getting real about the threats facing us, from Putin’s imperial ambitions and Trump’s insatiable demands to cyber-warfare and climate breakdown.

“For too long British leaders have had their heads in the sand. It’s time to wake up.”

Prime Minister Keir Starmer said the UK would not respond to US tariffs by entering a trade war (Image: PA)

It comes after Scottish Green co-leader Gillian Mackay called on First Minister John Swinney to ban US military planes from using Scottish airbases.

At First Minister’s Questions last week, Mackay said Scotland “must stand up to Trump and his contempt for international law, and reassure the people of Greenland that we will not be complicit in any part of an attempted annexation”.

Swinney responded: “I want to make it clear that I believe it is important that all of that infrastructure, if it were ever to be used, can only be used consistent with the international rules based system for the arrangements between countries, and I will ensure that is the case.”