Asked about a possible meeting between the two leaders in Vladivostok, Peskov said the economic forum is "open for all the leaders of the region" but added that Moscow has "so far" not received confirmation from Pyongyang that Kim Jong Un will attend.
He also said he aimed to begin construction of an inter-Korean railway this year, proposing an East Asian railroad community by including the United States, China, Japan, Russia and Mongolia. Analysts say Moon could try to act as a mediator between the USA and North Korea, having salvaged the Singapore meeting when Trump abruptly cancelled it.
"When we realize the dream of peace economy and economic community, our economy can take a new leap".
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In his opening statement, the North's chief delegate Ri Son Gwon said: "As the Pyongyang meeting of the leaders of the north and south is being discussed, I think talking about the issue will provide answers to the wishes of the people".
Citing research by the state-run Korea Institute for International Economic Policy (KIEP), the President said inter-Korean economic cooperation could bring in KRW 170 trillion (USD$150 billion) over the next 30 years.
"Peace and prosperity on the Korean Peninsula is a promise the two leaders made to the rest of the world".
South Korean president Moon Jae-in has announced he will head to Pyongyang next month for a third summit with North Korean leader Kim Jong-un.
Moon and Kim held their second meeting at the border village of Panmunjom on May 26. "We will have correspondence with the North Korean government as we look to denuclearize North Korea".
Last month, the North's state media criticized the South accusing it of only caring only about the views of the United States and failing to take practical steps to advance inter-Korean relations.
To lift economic sanctions, the United States insists the North take tangible denuclearization steps such as submitting a listing of its nuclear arsenal and nuclear and missile facilities.
The US State Department said on Tuesday that inter-governmental talks between the US and the DPRK will become a "regular course of business", with denuclearization of the Korean Peninsula as the focus.
Pyongyang called on the U.S.to reciprocate its "goodwill measures" by easing sanctions and claimed that Washington was following an "outdated acting script".
President Moon said that he and Japanese Prime Minister Shinzo Abe would work on developing bilateral relations in a future-oriented manner, and would cooperate closely with the aim of bringing peace and prosperity in the Korean Peninsula and Northeast Asia.
Whenever the summit is held, Moon will face a tricky balancing act: maintaining momentum for inter-Korean dialogue while also nudging Kim Jong Un to make progress in denuclearization talks with the USA, an ally of South Korea.