North Korea threatened Monday to take "physical action" after Washington and Seoul announced they would deploy a sophisticated US anti-missile defense system.

North Korea threatened Monday to take "physical action" after Washington and Seoul announced they would deploy a sophisticated US anti-missile defense system.

Seoul and Washington on Friday revealed their decision to deploy the Terminal High Altitude Area Defense (THAAD) system in the South following recent North Korean missile and nuclear tests.

The two allies have not yet revealed exactly when and where the system, which fires projectiles to smash into enemy missiles, would be deployed but said they were in the final stage of selecting a potential venue.

"The DPRK will take a physical counter-action to thoroughly control THAAD... from the moment its location and place have been confirmed in South Korea," the artillery bureau of the North's military said in a statement, according to the official Korean Central News Agency (KCNA).

North Korea's military, which has "sufficient latest offensive strike means", will take "more merciless and powerful successive corresponding measures against the US keen to ignite a war by deploying THAAD", it said.

It also warned the South of "miserable self-destruction" as a consequence of deployment of the THAAD system.

"We once again warn the enemies that it is the steadfast will of the KPA to make merciless retaliatory strikes to reduce south Korea to a sea in flames, debris once an order is issued," the statement said.

Seoul denounced the "ridiculous threats," saying the North "must recognize who is threatening peace and stability on the Korean Peninsula and first apologize for its provocations," defense ministry spokesman Moon Sang-Gyun told reporters.