Three U.S. nuclear-powered aircraft carriers are scheduled to engage in a four-day strike force exercise from Saturday, the U.S. 7th Fleet said Thursday, in a show of force amid North Korea's growing nuclear and missile threats.The exercise will take place in the Sea of Japan, a U.S. Navy official said, at a time President Donald Trump is on an Asian tour and is presenting a united front with regional leaders.Preparations are under way to have ships and aircraft of the Japan Self-Defense Forces join the exercise, a Japanese government source said.The three U.S. carriers engaging in the exer…READ FULL ARTICLE