The FTSE 100 Index plunged over 120 points, with other major European indices also registering substantial losses in early trading.
The controversy intensified after Trump threatened tariffs on nations not backing his Greenland acquisition plans, further detailing his intentions on Truth Social.
Investors sought safe haven assets, driving gold prices to a new record of $4,728 per ounce amidst the market uncertainty.
A critical meeting concerning Greenland is expected at the World Economic Forum in Davos, where Trump is set to discuss the territory's future.