The deal adds to Biden’s string of successful diplomatic initiatives aimed to reassert U.S. influence in Asia in the face of China’s growing economic, diplomatic and military muscle in the region. They include a historic Camp David summit Friday with Biden, Japanese Prime Minister Fumio Kishida and South Korean President Yoon Suk Yeol — aimed at addressing regional threats from North Korea and China.

The Vietnam agreement coincides with an uptick in tension between Hanoi and Beijing over long-standing territorial disputes in the South China Sea. Vietnam — along with the Philippines, Malaysia and Brunei — has long protested Beijing’s claim of authority over parts of the South China Sea that extend 1,200 miles from China’s coastline. Hanoi banned the Barbie movie last month due to a scene that appeared to reference the nine-dash line Beijing says marks its territorial waters. Satellite imagery released this week indicates China is building an airfield on an island that Hanoi says is Vietnamese territory.