"Following 50 years of progress in the relationship between our nations, from conflict to normalization, I am proud to have strengthened ties with Vietnam - a critical Indo-Pacific partner - even further," he wrote on X, formerly Twitter, Tuesday night.
"The United States is a Pacific nation, and we are not going anywhere."
A 90-second video recaps his state visit on September 10 and 11, starting with the official welcome he received from General Secretary Nguyen Phu Trong at the Presidential Palace followed by talks and meetings between them.
The video also includes clips of Biden meeting with President Vo Van Thuong, Prime Minister Pham Minh Chinh and National Assembly Chairman Vuong Dinh Hue.
"This trip has been a historic moment," Biden says in it.
"All the progress over the past 50 years – none of it was evitable. It required years of hard work from leaders in both countries."
He felt "incredibly proud" of how the two nations and peoples "have built trust and understanding over the decades and worked to prepare the painful legacy the war left on both our nations.
"It's work that we pledged today to continue.
"Our cooperation on these painful issues, as well as on forging new legacies, is one of shared peace and prosperity."
He called it "a powerful reminder of all we can accomplish when we're able to transcend the pain of the past and embrace a future of progress, one grounded on unity of our people.
"Vietnam is a critical power in the world, and a bellwether in this vital region. And I look forward to continuing this new chapter in the story of our nations."
The video ends with a footage of Biden speaking at a joint press conference with Trong at the Party Central Office on the afternoon of September 10.
Biden became the fifth U.S. president to visit Vietnam since the two countries normalized relations in 1995.
During his visit, the two countries announced an elevation of their relationship to a Comprehensive Strategic Partnership 10 years after they had established a Comprehensive Partnership.
They agreed that the most important factors in their ties are respect for the basic principles that guide their relations, including respect for the United Nations Charter, international law and each other's political institutions, independence, sovereignty, and territorial integrity.
After the announcement, the White House said the U.S. would step up cooperation with Vietnam in science and technology, education, commerce, economy, energy, climate change response, environment, healthcare, security, and war legacy remediation and bolster links between the countries' businesses.