US President Donald Trump has once again crossed what European officials describe as a critical line — and they fear he could do so again. This assessment was reported by Reuters, citing sources familiar with discussions inside European political circles.

According to the agency, EU leaders plan to reassess the framework of relations with Washington at an emergency summit scheduled for Thursday, January 22. The move follows a sharp shift in White House policy on Greenland that has unsettled European capitals.

European lawmakers, speaking on condition of anonymity, said Trump’s remarks about the possible introduction of tariffs and even the use of military force to secure control over Greenland have seriously undermined trust within transatlantic relations. These statements, they argue, have shaken assumptions that had long underpinned cooperation between the United States and its European allies.

As a result, EU governments now fear further abrupt moves by Trump, who is increasingly described in European circles as unpredictable and aggressive. Against this backdrop, discussions in Brussels are focusing on the need for a long-term strategy toward the United States — one that would apply both under the current administration and in the event of a future change of power in Washington.

One of the sources quoted by Reuters said Trump had crossed a point of no return and could easily do so again, stressing that there was no way back to the previous state of relations. European leaders, the source added, intend to debate this reality and consider reducing the EU’s heavy dependence on the United States across multiple sectors.

Earlier reports indicated that disagreements with Washington over Greenland have already prompted discussions in Europe about the possibility of developing an independent nuclear capability. EU leaders are said to be weighing options ranging from a stronger reliance on the nuclear forces of France and Britain to the creation of a separate European nuclear project.