Trump and Kim are scheduled to meet in Singapore on June 12. "But we have never sought economic development by pinning expectations on the USA and such a deal will never happen going forward either", Kim added.
"It is regrettable that the North's unilateral move to postpone the high-level inter-Korean talks, citing the annual South Korea-US air drills, does not conform with the spirit and goal of the agreements reached between the leaders of the two countries", the unification ministry said.
"The president is ready if the meeting takes place", White House spokeswoman Sarah Sanders told Fox News.
The joint U.S. -South Korea two-week military drills, known as Max Thunder, involve fighter jets and aircraft from the U.S. Air Force, Army, Navy and Marine Corps.
"The original conflict of interests endures", said Van Jackson, a strategy fellow at the Center for Strategic Studies at Victoria University of Wellington, and a former US Department of Defense adviser.
"Seeing the announced statements and responses from North Korea and the United States, we see the two parties as having a honest and serious attitude (to stand in each other's shoes)", the official said.
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On Wednesday, Trump told reporters that "we will see" when asked whether the summit was still on. On Wednesday, the President was briefed on additional statements from North Korea's disarmament negotiator rejecting the U.S. call for immediate nuclear disarmament and going after Bolton himself. On Tuesday, the White House attempted to downplay the threat that North Korea would cancel the proposed summit between Trump and Kim Jong-un.
"North Korea held the South Korean authorities "wholly accountable" for the scuttled North-South talks and unease in the North-South relations".
Experts said the demands were standard operating procedure for Pyongyang.
If Pyongyang's statements caught Washington and Seoul off guard, they reflected a well-established North Korean position: that it is only willing to negotiate with the United States as a fellow nuclear power.
Japan'sAsahi newspaper on Thursday reported the United States has demanded North Korea ship some nuclear warheads, an intercontinental ballistic missile (ICBM) and other nuclear material overseas within six months. In return USA would aid North Korean economy by lifting sanctions and allowing private capital to flow into the country.
"This exercise targeting us, which is being carried out across South Korea, is a flagrant challenge to the Panmunjom Declaration and an intentional military provocation running counter to the positive development on the Korean Peninsula", the KCNAreport said.