Polish Prime Minister Donald Tusk expressed on Monday that initiating trade wars is a grave error, following U.S. President Donald Trump’s announcement over the weekend regarding significant new tariffs on imports from Mexico, Canada, and China.

“Poland will undoubtedly advocate for reason and prudence. However, we must clearly state that any intentions to implement customs duties and engage in trade wars are fundamentally misguided,” he remarked to the press.

“I trust that a strong, clear, amicable, yet assertive European stance will resonate with the American administration.”

As EU leaders convene on Monday, they are preparing for the potential of facing severe U.S. trade tariffs themselves. “We must remain unequivocally united. It is essential to do everything possible to ensure that, in the face of threats from Russia or expansion from China, we do not engage in conflicts among allies,” Tusk stated to reporters before departing for Brussels.