North Korea said on Saturday that firing its rockets at the U.S. mainland was "inevitable" after U.S. President Donald Trump called Pyongyang's leader "rocket man," in a further escalation of rhetoric between the two leaders. North Korean Foreign Minister Ri Yong Ho's remarks before the United Nations General Assembly came hours after U.S. Air Force B-1B Lancer bombers escorted by fighter jets flew in international airspace over waters east of North Korea, in a show of force the Pentagon said demonstrated the range of military options available to Trump. "Through such a prolonged and arduous struggle, now we are finally...