The Obama administration is warning North Korea against launching a nuclear attack against America.
The move comes after North Korea nullified the Korean War 1953 Armistice agreement and threatened a nuclear strike on the United States.
National Security Advisor Tom Donilon said North Korea would face "the full range of our capabilities."
He added that the United States would not tolerate North Korea transferring nuclear weapons or materials to other countries.
Meanwhile, the White House also issued a warning to China, demanding the communist nation stop its cyber-attacks on the computers of U.S. businesses.
Donilon wants the Chinese government to crack down on hackers. China's government has regularly denied that it's been involved in these attacks.
The United States also wants China to help establish international rules for Internet conduct. American analysts have warned repeatedly that hackers from China have broken into American corporate computers.