The weekend test has been seen as an implicit challenge to Trump, who has vowed to take a tough line on North Korea. Trump says at a joint press conference with Canadian Prime Justin Trudeau that, "North Korea is a big, big problem and we will deal with that very strongly."
Trump has yet to release a strategy for dealing with North Korea's nuclear ambitions. He delivered a brief statement Saturday night saying the US will stand by Japan "100 per cent.
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