South Korean officials say THAAD will strengthen the country's missile defences, which now rely on Patriot-based systems, and will deter North Korea, which has missiles that can be fired from road-mobile launchers or submarines.
A spokesman for the Korea Asia-Pacific Peace Committee, a semi-official organ of North Korea, said in a statement that the United States was "going desperate to apply fresh sanctions and pressure on North Korea" following its test of a hydrogen bomb on Sunday, Xinhua news agency reported.
Speaking to CNN this week, Moon Chung-in, a special adviser to South Korean President Moon Jae-in, said the government had dropped its previous skepticism over THAAD "partly because of American pressure and partly because of the heightened threat of North Korea". The Russian president has confirmed his position that the North Korean nuclear issue cannot be solved with sanctions.
"The global community must unite to force North Korea to fulfil its United Nations obligations".
Most countries have condemned North Korea, with the United States, Japan and South Korea pushing for strong sanctions to punish North Korean leader Kim Jong Un's regime.
Putin and Abe held a bilateral meeting Thursday, after which both leaders reiterated their countries shared a common understanding of the threat that North Korea poses.
The two ministers also agreed to communicate with China and Russian Federation to enlist their support.
Though President Trump has claimed "talk of appeasement" with North Korea "will not work", Mr Putin said he believes the Trump administration is "willing to resolve the situation".
During his election campaign earlier this year, President Moon was a noted skeptic of THAAD, and called for greater dialogue with North Korea.
South Korea has carried out military drills since Sunday's nuclear test.
Putin said he and Abe discussed the prospect of a peace treaty officially ending World War Two hostilities, which has never been signed because of the territorial dispute.
"China will make close communication with relevant parties with an objective, fair and responsible attitude", Wang said without commenting if China would agree to curb oil exports to North Korea.
As the additional missile launchers arrived in Seongju late Wednesday, they were met by hundreds of protesters, who believe the system's presence could lead to environmental and health problems.
Moon went on to say that the two nations should be connected by "nine bridges" of cooperation - natural gas, railroads, harbors, electricity, artic sea routes, shipbuilding, employment and the agriculture and fisheries industries - to expand cooperation in diverse fields simultaneously.
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