Canadian PM Justin Trudeau has plunged Canada into a world war of international trash talk ... with a video he made calling out the U.S. and Great Britain.
Those two countries have been embroiled in a NATO-threatening battle of words since last Friday ... all because of the Invictus games -- an international sporting competition between wounded servicemen.
Barack & Michelle Obama fired the first smack shot via social media, calling out Great Britain ... and dropping the mic.
Of course the Brits would never surrender or appease (lol) .