North Korea sent a strong message to the U.S. Sunday morning, warning of a "merciless strike."
The warning comes just one day before the U.S. is set to begin its annual military exercises with South Korea, which North Korea considers practice for an eventual invasion.
Pyongyang said those drills are "reckless behavior driving the situation into the uncontrollable phase of a nuclear war," according to CNN. North Korea also declared that its army is the "strongest possessor" of intercontinental ballistic missiles, adding that its capable of striking the U.S. mainland as well as the U.S. territory of Guam.
CNN reports that the warning was printed in an official government newspaper.
This warning only adds to the tension between the U.S. and North Korea.
Defense Secretary Jim Mattis warned last week that a North Korean missile strike on the U.S. could "escalate into war very quickly."
That statement echoed an Aug. 11 tweet from President Donald Trump.
"Military solutions are now fully in place, locked and loaded, should North Korea act unwisely," Trump tweeted. "Hopefully Kim Jong Un will find another path!"
Military solutions are now fully in place,locked and loaded,should North Korea act unwisely. Hopefully Kim Jong Un will find another path!— Donald J. Trump (@realDonaldTrump) August 11, 2017
South Korean President Moon Jae-in, however, has promised citizens that there won't be a war on the Korean Peninsula.
Trump has also assured Moon that he will consult with South Korea before taking any military action.