Here is the statement put out after the trilateral summit in Tokyo:

Chinese Premier Li Keqiang, left, Japanese Prime Minister Shinzo Abe, center, and South Korean President Moon Jae-in, right, pose for photographs prior to their summit in Tokyo Wednesday. [YONHAP]
Leaders from South Korea, Japan and China on Wednesday adopted a special statement in support of the Panmunjom Declaration, which was signed at the inter-Korean summit last month and confirmed the shared goal of the two Koreas of complete denuclearization.

The special statement was made following a trilateral meeting in Tokyo of President Moon Jae-in, Prime Minister Shinzo Abe of Japan and Premier Li Keqiang of China, the first of its kind in more than two years. The last such three-way summit was held in November 2015 in Seoul.  [Joong Ang Ilbo]

Here is what was agreed upon that really matters during the trilateral summit:

At the Moon-Abe talks, the latter made it clear that sanctions imposed on the North should not be lifted unless Pyongyang demonstrates concrete denuclearization measures, emphasizing that the closing down of a nuclear testing site and a halt in the firing of ballistic missiles were not sufficient for sanctions relief.

“It is the timing that matters when it comes to easing or withdrawing sanctions altogether on North Korea,” the prime minister was quoted as saying by the Blue House during the bilateral summit talk with Moon in the afternoon.

“We should not reward the North for just shutting down the Punggye-ri nuclear site or stopping the test-firing of intercontinental ballistic missiles. We need additional and substantive actions from the North,” said Abe.

On the matter of easing sanctions, Moon stressed Seoul could not move to ease sanctions unilaterally, noting that sanctions were international agreements in which Seoul took part.

“There could be worries that South Korea could make a unilateral move to ease sanctions independent of the international consensus. There is no need for such worries,” he said. [Joong Ang Ilbo]

Basically Prime Minister Abe is making the case that North Korea was rewarded in past agreements for doing little to nothing in return.  This time they should not be rewarded until they take real measures to denuclearize.