CNN  —  Canadian Prime Minister Mark Carney said Canada must “look out for (itself)” as the fallout over top US officials sharing military operation details inside a popular messaging app reverberates among key intelligence allies and partners. “It’s a serious, serious issue and all lessons must be taken from any of those, including in this circumstance,” Carney told reporters on a campaign trail stop in Halifax, Nova Scotia Tuesday ahead of the country’s April 28 election. Canada has long been