North Korea's leader said his rocket forces are ready to "settle accounts with the U.S." in response to U.S. nuclear-capable B-2 bombers joining military drills with South Korea, according to the Washington Post.

The preparation plan, signed by Kim Jong Un, ordered rockets on standby to strike the U.S. mainland, South Korea, Guam and Hawaii, according to the Associated Press.

The leader's comments were made while speaking with senior generals early Friday, state media reported.  

The two B-2s flew from the U.S. to South Korean city of Osan Thursday, dropping eight dummy munitions on one of the country's bombing ranges, the Post said.

U.S. Defense Secretary Chuck Hagel said the addition of nuclear-capable B-2 stealth bombers to military drills with South Korea was part of normal exercises and not intended to provoke a reaction from North Korea, CBS News reported.