The United States and North Korea could reach a deal on declaring an end to the 1950-53 Korean War at a summit meeting this week between their two leaders, South Korea's presidential Blue House said Monday.

"I believe the possibility is open," South Korea's Yonhap news agency quoted Blue House spokesman Kim Eui-kyeom as saying. "There is no way of knowing what kind of a declaration it might be, but I believe the United States and North Korea may reach an agreement on the declaration of war's end at any degree."

U.S. President Donald Trump and North Korean leader Kim Jong Un are scheduled to hold their second summit on Wednesday and Thursday in the Vietnamese capital of Hanoi. The two leaders met in Singapore last June — the first time a sitting U.S. president met with a North Korean leader.