U.S. Secretary of State Mike Pompeo arrives at Noi Bai International Airport in Hanoi Tuesday for the second summit between U.S. President Donald Trump and North Korean leader Kim Jong-un. Reuters-Yonhap

U.S. Secretary of State Mike Pompeo arrived in Vietnam on Tuesday, hailing this week's second summit between President Donald Trump and North Korean leader Kim Jong-un as an "important opportunity" for denuclearization and peace.

Pompeo traveled to Hanoi on his own official aircraft, separate from Air Force One, and landed hours before Trump's scheduled arrival.

"Made it to Vietnam for President @realDonaldTrump's #HanoiSummit with the DPRK," Pompeo tweeted, referring to North Korea by its official name, the Democratic People's Republic of Korea. "Will be important opportunity to make progress on Singapore Summit commitments of transformed relations, building lasting peace, and complete denuclearization."

Trump and Kim are due to meet in Hanoi on Wednesday and Thursday to follow up on their first summit in Singapore in June.

The two leaders agreed then to work toward complete denuclearization of the Korean Peninsula in exchange for U.S. security guarantees.