North Korea says it has missiles that can hit the US mainland, in a statement two days after South Korea unveiled a missile deal with the US.
The statement said US bases in "Japan, Guam and the US mainland" were within its "scope of strike".
It follows Seoul's announcement on Sunday that it would almost triple the range of its own missile system.
Pyongyang is thought to be working on a long-range missile, but two recent rocket tests ended in failure.
North Korea's neighbours said the failed rocket launches - in April 2009 and April 2012 - were tests related to the development of the long-range Taepodong-2 missile system