SEOUL, Oct. 1 (Xinhua) -- South Korean President Moon Jae-in said on Monday that strong military would be key to a lasting peace on the Korean Peninsula as the two Koreas are walking on an uncharted path.

"The path we are walking is a path no one has gone. Strong defense capability is more important than ever as no one can predict what difficulty will come," Moon said during the ceremony, held at the presidential Blue House, to mark the 70th anniversary of the Armed Forces Day.

"Only when we have strength and confidence to defend ourselves, peace can last," said Moon who noted that South Korea and the Democratic People's Republic of Korea (DPRK) launched a "bold journey" toward peace and prosperity on the peninsula.

Moon and top DPRK leader Kim Jong Un held their third summit in Pyongyang last month, agreeing to completely denuclearize the peninsula and concrete ways to stop hostile acts between the two Koreas.

Moon said he could reach an agreement on military affairs during the Pyongyang summit with the DPRK leader as he had confidence in the military capability, noting that the two Koreas decided to end all hostile acts on land and in waters and the air.

Under the military agreement, South Korea and the DPRK agreed to set buffer zones near the military demarcation line (MDL), which separates the two Koreas, to prevent accidental clashes along the heavily armed border.

Moon said the driving force to create peace is a strong military, which can be supported by people's trust, vowing to devote all support for completing the ongoing military reform.