The South and North remain locked in a decades long conflict, Japan has no diplomatic relations with North Korea, while China is Pyongyang's only regional ally but has tense relations with Tokyo.
"The US is feeling uneasy as this might be proven in practice".
The newspaper statement read: 'Trump blustered early this year that the DPRK's final access to a nuclear weapon that can reach the USA mainland will never happen.
North Korea's ongoing pursuit of weapons of mass destruction is a "clear and present danger to all", U.S. Defense Secretary Jim Mattis said.
"The DPRK is about 10,400 km far away from NY".
The aircraft mounted with a camera was discovered last week in a South Korean forest near the border with the North.
The leaders will seek to "advance cooperation on economic and global issues" and "will also coordinate on North Korea- related issues, including countering the growing North Korean nuclear and missile threats", it added. There are no plans to integrate the missiles into the USA ballistic missile defense system.
The South Korean president has been open to more dialogue with North Korea since he was elected on May 10.
The US recently tested a defence system that it said successfully intercepted and destroyed a mock ICBM.
Michael Elleman, senior fellow for missile defense at the International Institute for Strategic Studies, says the need to flawless the two models of IRBMs North Korea is now working on before moving on to ICBM technology was like "learning to walk before trying to run".
South Korea's president signaled he'd take a softer stance on North Korea before being elected.
Trump has taken a hard line on Kim's kingdom as the tubby tyrant continues his quest for nuclear weapons - with bomb tests and missile launches.
The distance between the border and the THAAD zone in North Gyeongsang Province is around 270 kilometers.
Responding to Pyongyang's development of ballistic missiles and nuclear weapons, the USA and Seoul agreed to deploy the Terminal High Altitude Area Defense (THAAD) missile defense system to South Korea a year ago - a move which triggered outrage from both Pyongyang and Beijing.