Philippine President Ferdinand Marcos Jr. has held talks with his Indonesian counterpart, Joko Widodo.
The leaders agreed to strengthen security ties.
Marcos is visiting Indonesia on his first foreign trip since taking office.
Marcos and Joko exchanged a defense and security cooperation agreement on Monday.
It enables the two countries to stage joint military drills and share information.
The leaders stressed the Association of Southeast Asian Nations has a crucial role to play in promoting regional stability.
In the joint press conference after their talks, Marcos said, "We agreed that ASEAN is going to be the lead agent in the changes that we would like to see in continuing to bring peace to our countries."
Joko said, "Indonesia wants to ensure that ASEAN continues to be the locomotive of regional stability, peace and prosperity."
The Philippines and Indonesia have disputes with China over territorial rights and interests in the South China Sea, where Beijing is flexing its muscles.
Marcos and Joko agreed to cooperate more closely on managing maritime borders.
Marcos flies to Singapore on Tuesday on the second leg of his overseas trip.