USS Oklahoma City, a nuclear submarine of the U.S. Navy,... reportedly arrived in South Korea's southern port city of Busan on Thursday.
That's when North Korea fired two short-range ballistic missile into the East Sea,... and it marks the first time a nuclear submarine has docked in South Korea in 20 months.
While the U.S. Navy did not reveal why the submarine was sent to South Korea,... many see it as a show of force aimed at North Korea,... which has been increasing its military activities lately.
