European Union President Donald Tusk called on Donald Trump to reform the world order rather than bring it down, warning that trade wars can lead to "hot conflicts."

Tusk issued his appeal in opening remarks to an annual EU-China summit on Monday, as he made an explicit link between the European delegation visiting Beijing and the U.S. president's meeting later the same day in Helsinki with Russian President Vladimir Putin. The comments came a day after Trump called the EU his biggest "foe" due its stance on trade.

"The architecture of the world is changing before our very eyes and it is our common responsibility to make it a change for the better," Tusk said.