Is it true that Trump allowed Japan and South Korea to buy more highly sophisticated weapons?

On Sept. 5, local time, President Donald Trump said on social media that Japan and South Korea can buy more highly sophisticated weapons from the United States.

Previously reported: the White House said Trump promised Moon Jae-in a huge amount of military sales

According to South Korea on September 5, the U.S. White House said in a press release issued after the South Korea-U.S. summit phone talks on September 1, U.S. President Donald Trump agreed to South Korea's purchase of U.S.-produced military equipment worth billions of dollars in a phone call with South Korean President Moon Jae-in. In response, Park Su-hyun, a spokesman for Cheong Wa Dae, the South Korean presidential office, said the White House's statement meant that South Korea and the U.S. had reached an agreement in principle to begin negotiations to help South Korea introduce advanced weapons and technology.

A press release issued by the White House said that the two leaders agreed to deepen the alliance between the two countries and improve South Korea's defense capability by strengthening cooperation in the field of defense.

Park Su-hyun said the two leaders reached a **** understanding on the early construction of the ROK's three-phase countermeasures against the North's nuclear system kill chain, the ROK-type missile defense system, and the large-scale strike retaliation operational plan) and agreed to continuously strengthen cooperation in related fields.