Davos, Jan. 20 -- European Commission President Ursula von der Leyen on Tuesday warned the United States against imposing punitive tariffs on European allies over Greenland, calling it a "mistake" and saying such a move could hurt long-standing partnerships.

Making her position clear while addressing the World Economic Forum here, Leyen said, "The proposed additional tariffs are a mistake, especially between long-standing allies."

She went on to underline the importance of trust and commitment between partners, referring to an understanding already reached between the two sides.

"The European Union and the United States agreed to a trade deal last July. And in politics as in business, a deal is a deal. And when friends shake hands, it ...