SEOUL, South Korea — North Korea on Tuesday warned that the U.S. mainland is within range of its missiles and said that Washington's recent agreement to let Seoul possess missiles capable of hitting all of the North shows the allies are plotting to invade the country.

South Korea announced Sunday that it reached a deal with Washington that would allow it to nearly triple the range of its missiles to better cope with North Korean missile and nuclear threats. On Tuesday, North Korea called the deal a "product of another conspiracy of the master and the stooge" to "ignite a war" against the North.

In a statement carried by the official Korean Central News Agency, an unidentified spokesman at the powerful National Defense Commission said the North will bolster its military preparedness.