The Elders, an international organization of global leaders, has expressed its support for South Korea and President Moon Jae-in's efforts to denuclearize the Korean Peninsula, calling Moon's upcoming summit with North Korean leader Kim Jong-un a "precious opportunity" to achieve that goal, the presidential office Cheong Wa Dae said Wednesday.

In a letter to the South Korean president, The Elders said it wished to express its firm support for the direction set by Moon, Cheong Wa Dae spokesman Kim Eui-kyeom said in a press release.

"The Elders wish to express their firm support for the course you have embarked upon," said the letter, dated March 28.

"The possibility that diplomacy will succeed in making the Korean Peninsula a safer place, eventually leading to its complete denuclearisation, is a precious opportunity that cannot be allowed to pass by without the determined efforts of all those who can help," it added.

The Elders also insisted dialogue was the only viable solution.

"We are keenly aware of the many hurdles ahead but remain convinced that there is no serious alternative to negotiation with North Korea over its dangerous nuclear and intercontinental ballistic missile programmes," it said.

North Korea staged 10 missile launches in the less than seven months since Moon took office on May 10, 2017. Its provocations also include its sixth and most powerful nuclear test so far, staged last September.

The Elders is a non-profit organization founded by the late former president of South Africa, Nelson Mandela. It is currently led by former UN Secretary-General Kofi Annan, while its shortlist of members also includes the former South Korean chief of the world body, Ban Ki-moon.

Its letter to the South Korean leader came as Moon is set to hold a bilateral summit with the reclusive North Korean leader on April 27.

The summit, if held, will be the first inter-Korean summit since 2007 and the third of its kind in history.

Following the inter-Korean summit, the North Korean leader is set to meet US President Donald Trump for what will be the first-ever US-North Korea summit.

The proposed summits follow a flurry of inter-Korean dialogue and exchange during the PyeongChang Winter Olympic Games and Paralympic Games held in South Korea that were also attended by the communist North.

Moon's top security advisor Chung Eui-yong traveled to Pyongyang early March to help arrange the summits while also becoming the first South Korean official to meet the North Korean leader. (Yonhap)