Philippine defense officials say they will hold a large, 10-day military training exercise next month, aiming to strengthen the country’s ability to respond to any crisis caused by an “external threat.”

Although Manila did not name China explicitly when it announced the drills — the biggest in recent years — they come as Beijing has increased the frequency of its maritime patrols and coast guard maneuvers around several disputed reefs that lie within the Philippines’ Exclusive Economic Zone, or EEZ.

Several of those patrols have resulted in clashes and the use of aggressive maneuvers and accusations of vessel ramming. China, which claims almost all of the South China Sea as its own despite an international ruling to the contrary, insists that its actions have been in accordance with the law.

The Combined Arms Training Exercise, or Catex, will take place March 3-12, involving approximately 6,000 soldiers and live-fire drills involving some of the Philippines’ most advanced artillery weapons.

Expanded drills

In the announcement on Monday, defense officials said that unlike past exercises, this year’s Catex will be conducted across the archipelago, including the northern island of Luzon, the island of Visayas in Central Philippines, and the southern island of Mindanao.

The expanded drills will “strengthen our command-and-control capabilities, further enhancing our preparedness to respond to any challenge that may threaten our national security,” Philippine Army Chief Lieutenant General Roy Galido told media during a news conference on Monday.

Typhon missile system

While the Philippine military is expected to test the Autonomous Truck-Mounted Howitzer Systems, its largest artillery weapon, during the live-fire drills, Galido said the U.S.-made Typhon missile system, which has prompted concerns from China, won’t be part of the large-scale exercise.

The Philippine military is still “appreciating the system and being able to understand how to utilize it in our defense concept,” he told Hong Kong’s South China Morning Post in an interview on Monday.

The deployment of the Typhon missile system to the northern Philippines has prompted concerns from China. During a press conference Friday, Chinese Defense Ministry spokesperson Zhang Xiaogang urged Manila to “remove the [Typhon] system as soon as possible.”

Analysts say the Philippines should focus on building up anti-ship missile capabilities and procuring more unmanned aerial vehicles rather than buying expensive items like submarines, which the Philippines is reportedly considering purchasing from India.

“The anti-ship missiles can survive in a modern war with China, and it can really force the Chinese military planners to rethink their strategies,” Zachary Abuza, an expert on Southeast Asian affairs at the National War College in Washington, told VOA by phone.

Other experts say the military drills and the ongoing efforts to acquire missile or air defense systems are part of the Philippines’ attempt to strengthen its sea capabilities and deterrence against China.

“Given the Philippines’ limited materiel capabilities, these efforts are part of a long-term endeavor that will need continuity to ensure the Philippines will be able to muster the capabilities to pursue the objective of countering China’s maritime aggression,” Don McLain Gill, a lecturer in international studies at De La Salle University in the Philippines, told VOA in a recorded voice message.

‘Aggressive’ China action

The announcement of the drills comes amid another uptick in tensions between China and the Philippines after a Chinese navy helicopter allegedly flew within 10 feet of a Philippine patrol plane near the disputed Scarborough Shoal in the South China Sea on Tuesday.

The Philippine coast guard characterized the Chinese aircraft’s actions as “aggressive and escalatory” and said they remained “committed to asserting our sovereignty, sovereign rights and maritime jurisdiction” in the South China Sea.

Meanwhile, Southern Theater Command of the People’s Liberation Army — China's military — accused the Philippine aircraft of “illegally” intruding on the airspace above Scarborough Shoal, which China views as its territory, and said its troops “are resolute in defending national sovereignty and security as well as peace and stability in the South China Sea.”

Weakest link?

Experts say the latest incident reflects Beijing’s attempt to test the Philippines’ defense capabilities and the United States’ commitment to supporting Manila, which has a mutual defense treaty with Washington.

“China sees the Philippines as the weakest link in the U.S. security architecture in the Indo-Pacific region, so they are testing how effective Manila can push back against its assertive behaviors,” Stephen Nagy, a professor of politics and international studies at International Christian University in Japan, told VOA by phone.

He said while it’s important for the Philippines to strengthen defense cooperation with like-minded democracies, including conducting joint patrols and military exercises, Manila should also carefully calibrate its responses to Chinese aggression.

The Philippines’ response should “reciprocate the pressure that the Chinese are putting on them because the Chinese strategic mindset is based on the idea of active defense, which means when they pressure their opponents to escalate the conflict, that gives them the right to escalate their behaviors,” Nagy said.

New legal challenge possible

In addition to strengthening defense capabilities, the Reuters news agency reported last month that the Philippines may soon initiate a second legal challenge against China over the South China Sea by suing Beijing for allegedly damaging the marine environment.

Despite the report, Philippine Foreign Secretary Enrique Manalo said in response to a question from VOA during a public event held by the London-based think tank Chatham House on Tuesday that Manila has no plan to launch a legal challenge against China right now.

Joshua Espena, a lecturer of international relations at the Polytechnic University of the Philippines, told VOA that since the Philippines is gearing up for the parliamentary election in May, Manila is unlikely to initiate a new legal challenge against China at this point. “The 2016 South China Sea Arbitration ruling gives the Philippines sufficient ground to do what the government needs to do,” he said.

As the U.S. focuses on facilitating a peace deal to end Russia’s war in Ukraine, Nagy said, China will likely maintain its pressure campaign against the Philippines in the coming months.