Vietnam sits in a very interesting position in Southeast Asia,” said Rodger Baker, vice president of strategic analysis at geopolitical intelligence firm Stratfor. Because Hanoi maintains a strong position against Beijing’s activities in the South China Sea, Trump may eye Vietnam as a potential counter to China in the disputed area, Baker explained.

The world’s second-largest economy claims 90 percent of the sea, home to over 250 islands and rich natural gas reserves, while Vietnam, Brunei, Malaysia, the Philippines and Taiwan assert ownership of certain parts.

And as Beijing ramps up island-building and military construction in the maritime region — reports recently emerged of Chinese rocket launchers in the Spratly Islands — Hanoi has not shied away from publicly denouncing the mainland.

In 2014, Vietnam witnessed violent anti-China protests as demonstrators criticized China’s assertiveness in the important waterway while Vietnamese officials lambasted Beijing in March after a Chinese cruise ship visited the Paracel Islands, which are claimed by both countries.

China’s territorial expansion has also irked Washington, with Trump promising vowing to halt Beijing’s construction of artificial islands days after taking office. And while the president’s hands are currently tied as he seeks the mainland’s help on reigning in a hostile North Korea, the South China Sea issue still looms large — last week, the Chinese navy deployed two missile frigates to a U.S. Navy warship that sailed near the China-claimed Spratly Islands.

The Vietnamese PM’s visit to Washington “adds momentum to a U.S.-Vietnam relationship that is moving in an increasingly strategic direction,” Jonathan Stromseth, senior fellow at Brookings, described in a recent note.