North Korea threatened to “settle accounts with the U.S.” after nuclear-capable U.S. B-2 bombers flew over South Korea as part of a military drill.

Kim Jong Un “convened an urgent operation meeting” with his senior generals early Friday, signed a rocket preparation plan and ordered his forces on standby to strike the U.S. mainland, South Korea, Guam and Hawaii, state media reported.

Kim said “the time has come to settle accounts with the U.S. imperialists in view of the prevailing situation,” according to a report by the North’s official Korean Central News Agency. The flight by stealth bombers indicates U.S. hostility and shows that it has “entered a reckless phase, going beyond the phase of threat and blackmail,” Kim was quoted as saying.

Analysts say, according to AP, they’ve seen no evidence that Pyongyang’s missiles can hit the U.S. mainland.