The US has also carried out testing of its B61-12 gravity bombs, developed under the guidance of the National Nuclear Security Administration, in Nevada this week.
The guided bomb has been dubbed the "most expensive nuclear bomb ever made" capable of hitting targets more precisely than previous incarnations.
The test was of a non-nuclear version and used to evaluate an aircraft's ability to deliver the weapon. The B61-12 will replace four B61 bomb variants in the US nuclear arsenal with the first unit scheduled for March 2020.
The US government considers it an upgrade rather than a new weapon in a move that means it doesn't violate an Obama administration pledge to create no new nuclear weapons.
The United Nations and global leaders unanimously condemned Kim Jong Un's missile testing and are in the process of enforcing harsh economic sanctions against the rogue state.
On Wednesday, Australian Prime Minister Malcolm Turnbull said North Korea would lose any military contest "instantly".
"If the leader of North Korea continues down this provocative track, the risk of war gets greater all the time," he told A Current Affair.
"If he starts a war the reality, however, is he will lose it instantly. It would be a suicide note on his part," he said.
