North Korea on Thursday condemned U.S. approval of a possible $125 million arms sale to South Korea, warning of a "serious, immediate and powerful response."

Pyongyang says the potential sale of AIM-9X Sidewinder missiles and related equipment poses ‘a new threat’ to its security environment.

North Korea condemned on Thursday US plans to supply Seoul with tactical missiles and fund human rights monitoring projects, vowing a "powerful response" to what Pyongyang…