TAIPEI, Taiwan (AFP) — China has signaled its intent to maintain a new coast guard patrol east of Taiwan, analysts say, as Beijing dials up pressure on the self-ruled island that it claims is part of its territory.

Tensions over Western Pacific waters off Taiwan spiked after the Chinese coast guard and other ships launched their first “law enforcement operation” in that area in June.

During the operation, the China Coast Guard for the first time radioed cargo ships passing Taiwan for information about their crew and destination.

Chinese state media said the operation was in response to talks between Japan and the Philippines to draw a boundary in those waters.

But Taipei branded it “expansionism in disguise” and several Western governments expressed concern over the “novel” activity.

China Coast Guard vessels patrolling the waters since then have been replaced by a second group that will “continue law enforcement patrols,” China Coast Guard spokesperson Jiang Lue said Saturday.

“China is essentially announcing a new normal,” Ray Powell, director of SeaLight, which monitors China’s maritime activities, told Agence France-Presse (AFP).

China deploys fighter jets and navy ships around Taiwan on an almost daily basis, and Chinese coast guard ships regularly enter waters near Taiwan’s outer islands, including those off China.

Until June, however, China Coast Guard’s presence in waters east of Taiwan had been limited to “blockade-style military exercises,” William Yang, a senior analyst for the International Crisis Group, told AFP.

The patrols were “beyond just political signaling,” said Gregory Poling, director of the Asia Maritime Transparency Initiative at the Washington-based Center for Strategic and International Studies.

“Beijing appears to be claiming vast law enforcement rights across its claimed exclusive economic zone that go far beyond what is allowed by international law,” Poling told AFP.

Su Tzu-yun, a military expert at the Taipei-based Institute for National Defense and Security Research, said China’s patrols were establishing “new operational norms.”

“By conducting radio verification procedures for passing commercial vessels, China is effectively rehearsing the mechanisms required for a future blockade or quarantine,” he said.

For years, China has been steadily expanding its military and coast guard activities in waters around Taiwan and the region.

Taiwan’s National Security Bureau director-general Tsai Ming-yen said Monday that four Chinese formations including warships were operating in the Western Pacific, noting an “upward trend” in mobilisation during China’s peak maritime exercise season.