North Korea has announced that it is now in possession of "strategic rocket forces" capable of striking the US mainland. The announcement comes a day after the U.S and South Korea signed a deal to extend the range of the South's missile systems that would cover all of North Korea. On Tuesday, the spokesman for the National Defense Commission said Pyongyang was ready to match any enemy, "nuclear for nuclear, missile for missile", in a series of bulletins released on the official Korean Central News Agency (KCNA). "We are not concealing the fact that (North Korea's) revolutionary military, including strategic rocket forces, has placed not only South Korean enemy forces and US forces in the Korean peninsula but also Japan, Guam and even the US mainland within its target range," the spokesman said. In April, the North carried out a failed rocket launch in what it said was a bid to put a satellite into orbit.