MANILA, Philippines — US Vice President Kamala Harris will meet Philippine President Ferdinand Marcos on Monday during a visit to the Southeast Asian nation aimed at boosting ties between the longstanding allies.
Harris is the highest-ranking US official to visit Manila since Marcos took power in June.
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The trip is part of US efforts to remove any doubt about its commitment to the Asia-Pacific as China expands its clout in the region.
Relations between the Philippines and the United States were strained for years under the China-friendly former president Rodrigo Duterte.
Washington is seeking to bolster its security alliance with Manila under a new president and with rising regional tensions.
That includes a mutual defence treaty and a 2014 pact, known by the acronym EDCA, which allows for the US military to store defence equipment and supplies on several Philippine bases.
It also allows US troops access to five military bases there.
EDCA stalled under Duterte but the United States and the Philippines have expressed support for accelerating its implementation as China becomes increasingly assertive.
"We have identified new locations and have begun a process with the Philippines to finalise those," a US official told reporters on condition of anonymity ahead of Harris's meeting with Marcos and her counterpart Sara Duterte.
"The United States has allocated over $82 million towards implementation (of the existing bases) and more is on the way."
On Tuesday, Harris will visit the Philippine island province of Palawan, which lies along hotly contested waters in the South China Sea.
China claims sovereignty over almost the entire sea, while the Philippines, Vietnam, Malaysia and Brunei have overlapping claims to parts of it.
Beijing has ignored a 2016 international tribunal ruling that its claims have no legal basis.
Harris will meet members of the Philippine Coast Guard on board one of the country's two biggest coast guard vessels.
She will "reaffirm the strength of the alliance and our commitment to upholding the international rules-based order in the South China Sea and the broader Indo-Pacific," the US official said, using the US term for the Asia-Pacific.
Harris's trip comes after she and US President Joe Biden met separately with Chinese President Xi Jinping last week.
Harris reinforced Biden's message that "we must maintain open lines of communication to responsibly manage the competition between our countries" while speaking to Xi on the sidelines of the Asia-Pacific Economic Cooperation forum in Bangkok, a White House official said.
Among initiatives to be launched during Harris's trip to the Philippines are negotiations for a civilian nuclear pact between the United States and the Philippines.
That could lead to the future sales of US nuclear reactors to the Southeast Asian country.
Marcos is a strong supporter of renewable energy and has insisted on the need to reconsider building nuclear power plants in the disaster-prone country.
However, before the United States can sell nuclear equipment to the Philippines, the two countries must sign a civilian nuclear pact known as a "123 agreement", which is designed to prevent the spread of nuclear weapons.