"Through my participation at the UN General Assembly, I will discuss ways to fundamentally resolve the North Korean nuclear issue with other leaders of the international community," he added.

Moon arrived here earlier in the day on a four-day visit. He is set to attend the opening of the UN General Assembly on Tuesday, and deliver a keynote speech at the UN gathering later in the week.

The call for a fundamental solution to the North Korean nuclear standoff comes after the communist North staged its sixth nuclear test on Sept. 3, following a series of missile tests that led to a new sanctions resolution by the UN Security Council (UNSC) last month.

The UNSC unanimously adopted an additional resolution on North Korea early last week to punish it for its latest and apparently most powerful nuclear test staged so far. Pyongyang again launched what appeared to be an intermediate range ballistic missile that flew over Japan on Friday.

Moon has insisted and continues to insist that dialogue is the only viable means to resolve the North Korean nuclear issue, but says dialogue with Pyongyang is not currently possible.

While speaking with his US counterpart Donald Trump over the phone over the weekend, the South Korean leader stressed the need to thoroughly implement the UNSC sanctions against the North, so the impoverished state may realize it has no other option but to come to the dialogue table.

"The two leaders agreed to further strengthen the close cooperation between South Korea and the United States, and put more practical pressure on North Korea based on their cooperation to make North Korea realize it will only become more isolated diplomatically and face additional economic pressure if it continues to make provocations and eventually enter the path of collapse," Moon's spokesman Park Soo-hyun has said of the Moon-Trump conversation.

The two leaders agreed to continue their discussion when they meet here later in the week.

They are also scheduled to be joined by Japanese Prime Minister Shinzo Abe for a three-way summit on Thursday, according to South Korea's presidential office Cheong Wa Dae.

While thanking South Korean residents in the United States for their support for their motherland, the South Korean president said his country will work to make them proud by showing leadership in dealing with global issues.

"The country will continue to be a source of pride as a responsible middle power state in the international community," he said at the meeting.

Moon asked the overseas Koreans to take a special interest in the upcoming 2018 Winter Olympic Games to be held in South Korea's PyeongChang.

"Please let the United States and the rest of the world know the beauty and dynamics of winter in PyeongChang, Gangwon Province.

I am confident the PyeongChang Winter Olympics will be a great success as long as you are with us," he said. (Yonhap)