A nuclear-propelled US submarine has arrived in South Korea in the second deployment of a major US naval asset to the Korean Peninsula this month, South Korea’s military said yesterday, adding to the allies’ show of force to counter North Korean nuclear threats.

The USS Annapolis arrived at a port on Jeju Island about a week after the USS Kentucky docked at the mainland port of Busan.

The Kentucky was the first US nuclear-armed submarine to visit South Korea since the 1980s. North Korea reacted to its arrival by test-firing ballistic and cruise missiles in apparent demonstrations that it could make nuclear strikes against South Korea and deployed US naval vessels.