US President Donald Trump left the G7 summit ahead of schedule supposedly due to his antipathy for French President Emmanuel Macron and lack of interest in meeting with Ukrainian President Volodymyr Zelenskyy.

Justin Trudeau made a supposedly critical remark about Trump at the 2018 summit in Charlevoix, Que., which prompted a series of angry tweets, derailing the final hours of the meeting and the push for a G7 consensus on critical issues of the day.

Tensions arose at the G7 and NATO summits as Trump departed early due to disagreements with Macron and disinterest in meeting Zelenskyy. Spain resists NATO's 5% defense spending target, citing economic concerns and potential cuts to public services.