The two men, meeting for the third time in just over a year, also talked about the slow negotiations on a huge trans-Pacific trade deal that could eventually encompass 40 percent of the world economy.
"The two leaders discussed mutual concerns over a pattern of destabilizing behavior in the South China Sea and reiterated their mutual interest in international law, freedom of navigation and the peaceful resolution of maritime and territorial disputes," the White House said in a statement.
Washington says it does not take a position in the disputes, but its insistence that Beijing should follow "rules of the road" and discuss the matter in regional fora with American allies has antagonized China.
Biden and Lee also, yesterday, discussed the latest developments in the proposed 12-nation Trans-Pacific Partnership trade deal, currently snagged on long-running market access between the United States and Japan.
"Noting the advanced state of... Negotiations, the two leaders agreed on the importance of working together to finalize an ambitious, high-standard agreement as soon as possible," the statement said.