The new assessment by the Pentagon’s Defense Intelligence Agency (DIA), which shaves a full two years off the consensus forecast for North Korea’s ICBM program, was prompted by recent missile tests showing surprising technical advances by the country’s weapons scientists, at a pace beyond which many analysts believed was possible for the isolated communist regime.

The U.S. projection closely mirrors revised predictions by South Korean intelligence officials, who also have watched with growing alarm as North Korea has appeared to master key technologies needed to loft a warhead toward targets thousands of miles away.

The finding further increases the pressure on U.S. and Asian leaders to halt North Korea’s progress before it can threaten the world with nuclear-tipped missiles. President Trump, during his visit to Poland earlier this month, vowed to confront Pyongyang “very strongly” to stop its missile advances.