Friction between Canada and the United States quickly escalated over the weekend after U.S. President Donald Trump left the G7 summit in Charlevoix, Que. on Saturday.

Canadian Prime Minister Justin Trudeau declared in a press conference the country “will not be pushed around” by the United States, to which Trump followed up with a pair of tweets stating Trudeau is “weak” and “meek” amid the ongoing dispute on steel and aluminum tariffs.

White House trade adviser Peter Navarro and top economic aide Larry Kudlow carried out Trump’s message Sunday, blasting Trudeau’s “betrayal.”

It didn’t take long for leaders across the globe to weigh in on the tit-for-tat between the two leaders. Here’s what some of them had to say: