  North Korea is in the process of developing a new missile system for ships or submarines. A companion land-based missile is thought to have been developed already. The systems are based on the now decommissioned Soviet R-27 submarine-launched ballistic missile. The report, published in the authoritative Jane's Defence Weekly, says the land-based system has an estimated range of 2,500km to 4,000km (1,500 miles to 2,500 miles) while the sea-based system is thought to be capable of hitting a target more than 2,500km away. "These new land and sea-based systems appreciably expand the ballistic missile threat presented by the DPRK [North Korea]," the report said.
But the most significant part of the new developments appears to be the sea-based missile, as it could be transported almost anywhere in the world by submarine or ship. Such a system "could finally provide [the North Korean] leadership with something that it has long sought to obtain - the ability to directly threaten the continental US," the report warns. N Korea has already proved it has missiles, by publicly testing them 
