In a dramatic escalation of its maritime presence, China has sent warships and aircraft carriers across a wide swath of contested waters in East and Southeast Asia, sparking rising concerns among U.S. allies and military analysts. From the South China Sea to the Yellow Sea and now deep into the Pacific Ocean, China’s naval activity is being seen as a clear effort to dominate critical shipping lanes and intimidate neighboring countries.

The most recent flashpoint came during joint naval drills between the Philippines and Japan, two key U.S. allies. Their ships were closely followed by Chinese naval vessels as they conducted anti-submarine warfare exercises near Luzon, the Philippines’ main island. Although the Chinese ships did not interfere directly, their presence was clearly intended to send a message.

According to the Armed Forces of the Philippines, the exercise demonstrated “joint capability in a wide array of naval operations.” Japanese and Philippine officials emphasized that their actions were legal and aimed at defending freedom of navigation. “The activity was conducted in a manner consistent with international law and with due regard to the freedom of navigation and the rights and interests of other states,” said Japan’s Defense Ministry in a statement.

China’s response was swift. The People’s Liberation Army Southern Theater Command accused the Philippines of creating “security risks” by conducting joint drills with “non-regional countries,” a veiled reference to Japan. Colonel Tian Junli, a Chinese military spokesperson, claimed Chinese forces would remain on alert to “resolutely safeguard” China’s sovereignty in the South China Sea.

Confrontations Over Fishing Grounds and Maritime Control

This naval standoff is not an isolated case. Just weeks earlier, the Philippines sent coast guard and fisheries ships to supply fishermen near Scarborough Shoal, a disputed reef well within the Philippines’ exclusive economic zone. China responded with an aggressive show of force. Satellite data and video confirmed that at least nine Chinese ships, including coast guard and militia vessels, attempted to block Philippine access to the reef.

Philippine officials said the mission was meant to support local fishermen and reassert their rights to the fishing grounds. “The mission underscored BFAR and PCG’s commitment to maritime safety and support for Filipino fishermen,” said coast guard spokesperson Jay Tarriela. But China dismissed the mission as a political stunt. Chinese Foreign Ministry spokesperson Guo Jiakun warned, “Those who willingly serve as chess pieces will be deserted in the end.”

This conflict is part of a broader campaign by Beijing to enforce its so-called “ten-dash line,” which claims nearly all of the South China Sea as Chinese territory, despite overlapping claims by Vietnam, the Philippines, Malaysia, and others. The international community has rejected these claims. Philippine Defense Secretary Gilberto Teodoro put it bluntly: “No ASEAN country accepts the legitimacy of that 10-dash line, because that is the biggest fiction and lie that can be sold to any right-thinking person.”

Rising Tensions in the Yellow Sea

To the north, tensions are also growing between China and South Korea over disputed waters in the Yellow Sea. Under a 2000 agreement, the two countries designated a “Provisional Measures Zone” where their exclusive economic zones overlap. But China has begun building structures in this area and recently declared multiple “no-sail zones” to conduct military exercises, some of which extended into South Korea’s recognized waters.

The South Korean military confirmed that China had conducted large-scale training involving aircraft carriers in the area. They also noted the placement of at least thirteen Chinese buoys, which they believe could be used for surveillance. A South Korean official warned that the government is “closely monitoring the related situation,” including the possibility that these devices have military purposes.

China has defended its actions as legal and routine. “What China set up in the provisional measures zone are the aquaculture facilities,” said Foreign Ministry spokesperson Guo Jiakun. But South Korean media and defense experts have raised the alarm, saying China’s behavior in the Yellow Sea mirrors the same gradual and strategic encroachment seen in the South China Sea.

Aircraft Carriers Reach the Open Pacific

Perhaps the most concerning development for the West is China’s recent deployment of multiple aircraft carrier strike groups deep into the Pacific Ocean. For the first time, China’s Liaoning and Shandong carriers operated together beyond Japan’s island chain, conducting joint drills that included fighter jet launches and simulated strikes.

Japan’s Defense Ministry reported that these carriers were operating in waters southeast of Miyako Island, within reach of Japan’s easternmost territories. Chief Cabinet Secretary Yoshimasa Hayashi said China is “planning to improve the operational capability of its aircraft carriers and their ability to conduct operations in distant areas of the sea.”

Analysts agree that this marks a new phase in China’s strategy. Ray Powell, director of Stanford University’s SeaLight maritime project, called it a “significant milestone.” He said, “The PLA is demonstrating a capability for sustained carrier operations outside of the first island chain.” Former U.S. Navy captain Carl Schuster added, “China has become a major naval power that can and will apply that power in neighboring waters if it chooses.”

The Growing Threat of the Fujian Carrier

At the center of this expanding naval power is China’s newest aircraft carrier, the Fujian. Still in sea trials, the Fujian is believed to be the largest warship ever built by a country other than the United States. It uses electromagnetic catapults, a cutting-edge system that allows jets to take off with more weapons and fuel than ever before. Only one other ship in the world—the U.S. Navy’s USS Gerald R. Ford—has this system.

The Fujian recently conducted its first at-sea aircraft launches in the Yellow Sea, just across from South Korea. Chinese officials described the trials as “routine training,” but South Korean officials confirmed the ship’s presence and raised concerns about the location and timing. The Fujian is expected to carry advanced stealth fighters like the J-35, which cannot operate from China’s older carriers.

China is already building a fourth carrier, the Type 004, which will likely be nuclear-powered. That would allow it to stay at sea indefinitely without refueling, a key advantage held by the U.S. Navy’s fleet.

In response, the United States and its allies have been stepping up their own military cooperation. U.S. Defense Secretary Pete Hegseth, during a visit to Asia, warned against Beijing’s rising aggression. “Any unilateral attempt to change the status quo in the South China Sea and the first island chain by force or coercion is unacceptable,” he said at the Shangri-La Dialogue security summit in Singapore. He also warned that China appears to be “credibly preparing to potentially use military force to alter the balance of power in the Indo-Pacific.”

The U.S. has expanded access to bases in the Philippines, increased surveillance flights, and is pushing for more joint naval drills with allies like Japan, South Korea, and Australia. Japan has also begun refitting its ships to carry U.S. F-35B stealth fighters, signaling a more active role in regional defense.

What was once a regional rivalry is now becoming a global competition. The PLAN is no longer confined to defending China’s coast. It is reaching far into the Pacific, conducting exercises with hundreds of ships, advanced warplanes, and new technologies. As Schuster pointed out, “Beijing’s carrier program, like its fleet, is expanding and improving rapidly, not just with new ships but with new aircraft.”

While analysts caution that China still lags behind the U.S. in experience and global logistics, the direction is clear. Powell summarized it best: “China’s carrier force is still very much developmental at this stage. Still, China is closing the gap.”