Japanese Prime Minister Shigeru Ishiba said Tuesday that his country and the Philippines would start talks on two proposed defense pacts to further boost their security alliance and would continue to fight aggression in disputed Asian waters in an obvious rebuke of China.

The Philippines and Japan plan to expand their security partnership, their leaders said, as both countries grapple with maritime disputes with China.

United by a shared unease about China’s growing maritime assertiveness, Manila and Tokyo have pledged to build on the substantial advances of recent years.