 Pentagon, North Korean missiles capable of striking U.S. territory. Ballistic missiles currently being tested by North Korea will be capable of reaching the U.S. territory, although it is unclear whether they can cover the distance if fitted with a nuclear warhead a high-ranking U.S. military official has said. The capability that they've delivered and demonstrated we assess could reach the United States. The commander of the United States, Indo-Pacific Command Admiral John Aquilino, told the Aspen Security Forum. All the nuclear capability is still being reviewed, he said, adding that this project would require miniaturizing the warhead and it's not clear if they've achieved that capability yet. In this case, for the first time in decades, a nuclear-capable U.S. Navy ballistic missile submarine has made a port call in South Korea. The presence of the Ohio-class ballistic missile submarine in the South Korean port city of Busan was announced by the country's defense ministry last week. The arrival of the submarine follows a period of heightened tensions on the peninsula, during which North Korea has both tested what it said was an advanced long-range missile and threatened to shoot down U.S. military reconnaissance aircraft engaging in what it called hostile espionage activities near its territory.