The BBC reports that "North Korea had previously threatened that any criticism of the rocket launch would cause it to walk away from the negotiating table."
But analysts describe North Korea's statement as "unusually strong" and fear that it will heighten regional tensions, reports Agence France-Presse.
Kim Yong-Hyun, a professor at Seoul's Dongguk University, said Pyongyang's response raises the possibility of armed provocations.
"The strong North Korean statement means tension will rise further around the peninsula for a while," he told AFP. "It raises the possibility of military provocations by North Korea.
"North Korea is ratcheting up the stakes. Its brinkmanship, of course, is designed to win maximum concessions from the US and international community."