A Taiwan security source told Reuters that on Saturday the Chinese drills around the Bashi channel, which separates Taiwan from the Philippines, included simulated attacks on aircraft carrier groups as well as anti-submarine drills.
Last August, after a visit to Taipei by then US House speaker Nancy Pelosi, China staged war games around Taiwan including firing missiles into waters close to the island, though it has yet to announce similar drills this time.
US channels of communication with China remain open and the US had consistently urged restraint and no change to the status quo, said a spokesperson for the American Institute in Taiwan, which serves as an embassy in the absence of formal diplomatic ties.
Washington severed diplomatic relations with Taipei in favour of Beijing in 1979 but is bound by law to provide the island with the means to defend itself.
China, which has never renounced the use of force to bring the island under its control, says Taiwan is the most important and sensitive issue in its relations with the US, and the topic is a frequent source of tensions.
Chinese state media said the aircraft flown into the ADIZ this weekend were armed with live weapons.
Taiwanese air force jets also typically carry live weapons when they scramble to see off Chinese incursions.
Still, civilian flights around Taiwan, including to Kinmen and Matsu, two groups of Taiwan-controlled islands right next to the Chinese coast, have continued as normal.
In August, civilian air traffic was disrupted after China announced effective no-fly zones in several areas close to Taiwan where it was firing missiles.
His comments risk riling Washington and highlight divisions in the European Union over how to approach China, as the US steps up confrontation with its closest rival and Beijing draws closer to Russia in the wake of its invasion of Ukraine.
Reuters contributed reporting
