The first of two Terminal High Altitude Area Defense (THAAD) interceptors is launched during a successful intercept test. The test, conducted by Missile Defense Agency (MDA), Ballistic Missile Defense System (BMDS) Operational Test Agency, Joint Functional Component Command for Integrated Missile Defense, and U.S. Pacific Command, in conjunction with U.S. Army Soldiers from the Alpha Battery, 2nd Air Defense Artillery Regiment, U.S. Navy sailors aboard the guided missile destroyer USS Decatur (DDG-73), and U.S. Air Force airmen from the 613th Air and Operations Center resulted in the intercept of one medium-range ballistic missile target by THAAD, and one medium-range ballistic missile target by Aegis Ballistic Missile Defense (BMD). The test, designated Flight Test Operational-01 (FTO-01), stressed the ability of the Aegis BMD and THAAD weapon systems to function in a layered defense architecture and defeat a raid of two near-simultaneous ballistic missile targets
There was no deceleration of war. The North Korean statement regarded US sanctions as an “effective deceleration of war”. This is all bluster
The North Koreans can’t declare a war because they’re already fighting the US. The Korean War is on pause due to an armistice in 1954. The belligerents never ended the war. In reality we’ve lived most if not all our lives at war with North Korea and nothing has happened.
Even if the war breaks out, the DMZ is the most fortified location on earth. No one is crossing it intact.
On the nuclear side, most North Korean missiles are very short ranged. Also the US has its Terminal High Altitude Area Defense (THAAD) system in Korea. Currently THAAD has a 100% intercept rate when tested against current missile systems. Any nuclear strike would be a wasted effort.