Aerial view of fishing boats setting sail to South China Sea for fishing on August 16, 2022 in Yangjiang, Guangdong Province of China.
Hundreds of fishing boats anchored for months at a time among disputed islands in the South China Sea.
The civilian vessels do more than just augment the raw numbers of ships, performing tasks that would be difficult for the military to carry out.
"Because they are ostensibly civilian fishing vessels, navies' ships are unable to deal with them lest China accuse the Philippines of provoking an incident and using force against civilians," he said.
In the event of a conflict, China's use of civilian vessels would complicate the rules of engagement, he said.