North Korea has said its military forces are ready to take any action necessary after a US Navy fast-attack nuclear submarine docked in a port in the South Korean city of Busan, and accused the United States of posing a grave threat to its national security.

The nuclear-powered USS Alexandria, a Los Angeles-class vessel based in San Diego, docked Monday at Busan, about 200 miles southeast of Seoul, U.S. Naval Forces Korea spokesman Lt. j.g. Tony ...

Yonhap news agency reported that the USS Alexandria, a nuclear-powered submarine, arrived at Busan naval base in South Korea on Monday. The last U.S. submarine to visit Busan was the USS Vermont ...

North Korea has accused the United States of carrying out a "hostile military act" after a US Navy submarine docked in a port in South Korea, saying its military forces would "punish the provokers." The USS Alexandria submarine docked at the port in the city of Busan on Monday for supplies and for its crew to rest,