An intense week of diplomacy kicks off on Monday as European leaders try to find a common position to counter Donald Trump's threat of additional tariffs on countries that do not support the US takeover of Greenland.

A lot of meetings, including between Europeans and Americans, are set to take place on the sidelines of the World Economic Forum in Davos, where world leaders will gather this week.

EU leaders will meanwhile convene in Brussels for an extraordinary summit later this week.

Ambassadors from across the bloc already had a first conversation at 27 on the topic on Sunday evening where the European Commission presented several options to hit back at the US, including the introduction of a list of retaliatory measures worth €93 billion and the activation of the Anti-Coercion Instrument, which would allow broader retaliation in other economic sectors and levers. The tool has never once been triggered.

Follow our live blog below to keep abreast of this fast-developing story.

European leaders are poised to continue working the phones on Monday to intensify diplomatic efforts and prevent Donald Trump's 10% tariff threat from becoming a reality.

British Prime Minister Keir Starmer, Italian Prime Minister Giorgia Meloni and NATO Secretary General Mark Rutte were among the first ones to speak direclty with Trump in a bid to contain the spiralling crisis over Greenland's future. We can expect other leaders to attempt a similar outreach in the coming hours and days. Meanwhile, António Costa, decided to convene an extraordinary EU summit for later this week after spending the weekend calling presidents and prime ministers across the bloc.

Diplomats in Brussels underscore the extreme gravity of the challenge posed by Trump's annexationist agenda but say hope is not all lost and diplomacy still has a role to play. Many European leaders will be present at the World Economic Forum in Davos, Switzerland, where Trump is expected to make a much-talked-about appearance. We will keep an eye out for any possible bilateral or multilateral meetings.

EU countries on Sunday night reviewed their options to respond to threats by US President Donald Trump to impose 10% tariffs on several member states from 1 February unless they allowed him to acquire Greenland.

Diplomacy was agreed to take precedence over immediate countermeasures, though a decision on whether to revive the €93 billion retaliation package - suspended last year - is to be taken after Trump’s deadline.

Among the tools discussed was also the EU’s anti-coercion instrument, often dubbed as its trade “bazooka,” though no vote was held on whether to deploy it.

More in our story on Euronews.

European Union countries will not yet deploy the anti-coercion instrument (ACI) in response to Trump’s Greenland tariff threats, people familiar with the matte…

British Prime Minister Keir Starmer is to address the nation at 10.15 CET on the issue.

The speech from Downing Street comes after Starmer spoke with multiple of his counterparts on Sunday including Danish Prime Minister Mette Frederiksen, European Commission President Ursula von der Leyen, and NATO Secretary-General Mark Rutte.

According to the British read-out of the calls, Starmer said that applying tariffs on allies for pursuing the collective security of NATO allies is "wrong" and that security in the High North is "a priority for all NATO allies in order to protect Euro-Atlantic interests."

We will, of course, live blog his speech later this morning.

With just one single post on his social media account, US President Donald Trump has brought the transatlantic alliance, and the security order that was forged at the end of World War II and has endured countless political shifts, to the brink of collapse. Trump has openly threatened eight allied countries with a 10% tariff to force them into giving up Greenland, a semi-autonomous territory that belongs to the Kingdom of Denmark and that refuses to be sold to the highest bidder.

"This Tariff will be due and payable until such time as a Deal is reached for the Complete and Total purchase of Greenland," Trump wrote on Saturday.

Though we are still days away from knowing whether the tariff threat materialises or vanishes, the mere fact that it has been made cuts through the foundations that underpin the transatlantic alliance, most notably the principle of collective defence, which, until now, has acted as a powerful deterrent against foreign attacks. If the US is able, and willing, to threaten another NATO member with outright annexation, can the other allies expect the US to abide by its obligation in a future conflict? After all, collective defence is based on trust and reliability, so if the expectation disappears, what is the point of the alliance? Can NATO deter Russia's expansionism in the East while it counters Trump's expansionism in the West?

It cannot be understated that this is a situation of extraordinary gravity that will compel Europeans to reckon with their long-standing dependency on America's security umbrella and take painful decisions that, until Trump's re-election, would have seemed unthinkable. The days ahead could very well become a watershed chapter that structurally redefines the 80-year-old bond between the two sides of the Atlantic. That is, if that bond manages to survive.

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Curated by Marcus Thompson