Marco Rubio meets with Russian foreign minister amid tensions over Ukraine and Trump releases tariff letters to trading partners.

The move injects fresh turmoil into a strained bilateral relationship as Prime Minister Mark Carney negotiates a new economic partnership with the United States.

Canada's retail sales shrank by 1.1% in May as consumers curtailed car purchases and spent less at supermarkets, convenience stores and on alcohol, data showed on Thursday.

Canada is one of the United States' top trading partners, with more than $410 billion of goods crossing into the country last year.

Trump recently said he will impose a 35% tariff on Canada, the latest salvo in his on-again, off-again trade war with the U.S. ally and top trade partner.

President Donald Trump’s vows to roll out punishing new tariffs on Aug. 1 have barely made a ripple with investors who are convinced he’ll once again back down. But at the White House, officials insist they’re serious this time.