Vietnam: From enemy to partner

That's why Obama's visit makes so much sense, and represents another step on the path from war, through normalization, and to partnership. But what happens after the president departs Vietnam will be more important still.

The administration is expected to announce a repeal of the ban on lethal arms sales to Vietnam, a welcome step that would build upon the 2014 decision to lift restrictions on sales of weapons related to maritime security.

Given Vietnam's legacy Russian systems and limited defense budget, Washington should help bolster its defense capabilities by ensuring that Vietnam receives assistance under the new, $425 million Maritime Security Initiative as well as other financing programs. Hanoi's acquisition of radars, surveillance drones, reconnaissance aircraft and other systems would enhance its maritime domain awareness and its ability to secure its littoral areas.

The events of 2014, during which a Chinese offshore oil drilling rig sailed well inside Vietnam's exclusive economic zone, demonstrated the need for maritime-related assistance to Vietnam.

Before the rig withdrew, Chinese vessels repelled Vietnamese efforts to interdict its operations, rammed Vietnamese boats and succeeded in sinking one. Given China's threats to freedom of navigation and efforts to claim much of the South China Sea as its own, the United States has an interest in helping partners like Vietnam deter new provocations.

The ability of the U.S. Navy to access ports in Vietnam will likely be under discussion during the President's visit, and in its aftermath Washington should encourage the opening of those ports not only to American vessels, but also to those of other friendly militaries. Vietnam has established an international facility at Cam Ranh Bay, one of Southeast Asia's finest deep-water ports and a major U.S. military hub during the war. Washington should seek the ability to operate out of Cam Ranh and encourage its further development as a regional locus for naval operations. The visit earlier this year of two Japanese destroyers is but one example of what is possible.

Vietnam has a broader role to play in the Pentagon's recent embrace of networked security in Asia, a vision that supplements America's four bilateral alliances with a web of connections among partners and allies. Over the past year alone, Hanoi has beefed up defense ties with Japan, Australia, Singapore and the Philippines. These developments have a stabilizing effect on a region in which China is throwing around its ample weight.

In addition to deepening security ties, there are other items that should fill the bilateral agenda after Obama departs Vietnam. The U.S. Congress must either approve the Trans-Pacific Partnership agreement or suffer a major setback to America's strategic position in Asia. Washington should be vocal both publicly and privately about human rights abuses in Vietnam, and push for greater religious freedom, basic liberties, and the release of political prisoners.

Vietnamese leaders should know that their brand of autocracy will place an inevitable constraint on closer ties with the United States. And the United States should demonstrate, in word and deed, that its presence and commitment to Asia is enduring.

Here the increasing warmth between the United States and Vietnam can prove particularly effective. At a moment of constrained defense budgets, rising Chinese assertiveness, and questions about the future trajectory of U.S. foreign policy, locking in the transformation of Vietnam from enemy to partner would say a great deal about American priorities. President Obama's visit represents the chance to begin writing that new chapter.