They underlined the severity of the last missile test carried out by North Korea on September 15 during which it fired a medium-range missile that travelled about 3,700 km and flew over northern Japan.
"President Moon asked for active support and cooperation of Czech, a powerhouse of winter sports, and expressed hope many Czech people will visit South Korea for the Winter Olympic Games", Seoul's presidential office, Cheong Wa Dae, said in a press release.
The standoff over North Korea's weapons development has intensified as its autocratic leader Kim Jong Un has accelerated his nation's development of a nuclear-tipped missile that could soon strike the continental United States. Leader Kim Jong Un has threatened to fire missiles into waters near Guam, home to USA military bases in the Pacific.
Cirincione elaborated by saying that no ballistic missile defense system in existence can even reach the height which the North Korean missile test achieved, according to Defense One.
"In case the U.S. opts for confrontation and war... it will meet a awful nuclear strike and miserable and final ruin", North Korea said.
"The two leaders also exchanged views on the current situation on the Korean Peninsula".
Pyongyang conducted two intercontinental ballistic missile (ICBM) tests in July and earlier this month said it successfully tested a miniaturized hydrogen bomb that can be placed on an ICBM.
"We have open dialogue with our allies on any issue that they want to bring up", he said.
Most recently, USA president Donald Trump condemned the North Korean regime during the general debate of the 72nd Regular Session of the United Nations General Assembly on Tuesday.
Meanwhile the USA and Chinese leaders have committed to "maximising pressure on North Korea", the White House has said. Mattis acknowledged discussing that with his South Korean counterpart but declined to say whether that option was under consideration.
Because the KN-17 appears to be successful, the official says the U.S. has assessed that it is likely North Korea will turn back to additional testing of the KN-20 (aka Hwasong 14) intercontinental ballistic missile to see if they can improve its performance. "What we've done with the sanctions is we are putting the leader in North Korea in a position to be aware that the global community, voting unanimously twice now in the United Nations Security Council, seeing the increasing diplomatic isolation that comes with it, comes with the economic sanction that there's a penalty to be paid for ignoring worldwide concerns and norms".