North Korea, meanwhile, has not ceased its daily threats to attack the United States and South Korea.
Speaking after the talks with the visiting South Korean president, Putin in televised remarks urged North Korea's neighbors to support the Russian-Chinese roadmap.
North Korea says it detonated a hydrogen bomb in its sixth nuclear test on Sunday.
Putin said the nuclear test "flagrantly violates" global law.
Mother dies trying to save her daughter while escaping from Hurricane Harvey
Two police officers and fire rescue officers used a rubber boat to reach the pair and managed to drag them onto the boat. A mother in Texas has died as she tried to get herself and her daughter to safety in the aftermath of Hurricane Harvey.
The defense ministry's Wednesday announcement came just two days after it vowed to install the four additional launchers, saying they would "soon be tentatively deployed through South Korea-US consultations in order to counter North Korea's advancing nuclear and missile threats". He said it "offers a genuine way to defuse the tensions and a step-by-step settlement". Moon also called for a ban on overseas North Korean workers - many of them in China and Russian Federation - who provide foreign currency to the North. His government has taken a harder stance as the North continued its torrid pace of weapons tests.
In an interview with the Russian news agency Tass on Tuesday, Mr Moon said he believes now is not the time for talks and it is important for the global community to strengthen pressure against Pyongyang.
South Korea's defense ministry said Wednesday that the US military will install the four additional THAAD launcher early Thursday morning.
Although focused on deterring North Korea, China and Russian Federation see the system as harmful to their security interests.
South Korean Defense Minister Song Young-moo is encouraging the U.S. to regularly deploy "strategy assets", like aircraft carriers and nuclear bombers in the country.