US Secretary of State Rex Tillerson said that Washington would not accept any preconditions for talks with Pyongyang.
Speculations surrounding Hwang’s execution is rife because Kim had last week visited Mount Paektu -- something he typically does ahead of passing a death order of his top brass.
A National Security Council spokesperson said that North Korea must not only first refrain from provocations but take "sincere and meaningful actions toward denuclearization."
In comments attributed to an unnamed Foreign Ministry spokesman, North Korea also claimed high-ranked US officials, including CIA Director Mike Pompeo, have further confirmed American intent for war with a series of "bellicose remarks."
AN American citizen, Jeffrey Feltman, the UN undersecretary-general for political affairs, is the first person in his position to visit Pyongyang since 2010.
US Ambassador Nikki Haley told an emergency meeting of the UN Security Council that North Korea's latest test of an intercontinental ballistic missile (ICBM) "demands that countries further isolate the Kim regime."
In some of the photos, North Korean dictator Kim Jong Un can also be seen inspecting the missile test which some observers believe could reach Washington and the entire US Eastern Seaboard.
The step might be taken as part of Trump's strategy to counter the North's growing nuclear threat.
North Korea is working on an advanced version of its existing KN-20 intercontinental ballistic missile that could potentially reach Washington.