WASHINGTON - US President Donald Trump said 'we'll see' when asked whether the United States would attack North Korea, as he left a church service. North Korea said it had tested an advanced hydrogen bomb for a long-range missile on Sunday, setting off a manmade earthquake near the test. Earlier Sunday, Trump had said on Twitter, 'South Korea is finding, as I have told them, that their talk of appeasement with North Korea will not work, they only understand one thing!'