Leaders have strongly condemned an assault on Danish Prime Minister Mette Frederiksen in a central Copenhagen square, adding to the alarming rash of political violence rattling Europe. European Commission President Ursula von der Leyen called it a “despicable act which goes against everything we believe and fight for in Europe” in a post on the social media platform X. Charles Michel, the president of the European Council, said he was “outraged” by the “cowardly act of aggression.” Frederiksen, 46, was left “shocked by the incident” on Friday evening in which she was hit while in Kultorvet squ…