Flight-tracking software showed a U.S. Navy patrol aircraft conducting a routine operation in the Bashi Channel, south of Taiwan, on Monday.
The move follows Beijing expressing displeasure over Lithuania's plan to deepen ties with Taiwan amid support from European lawmakers.
A German MEP said on Thursday that China's ambassador in Brussels tried to stop lawmakers from adopting the resolution, which seeks to upgrade EU-Taiwan ties.
In an annual report prepared for lawmakers, Taiwan's Defense Ministry gave its latest assessments of China's military capabilities and ambitions.
A Taiwanese official says the ruling party did not hesitate when invited to hold unprecedented security talks with Japan to discuss mutual concerns about China.
Former Ambassador Kelly Craft said China was exploiting the lives of U.S. and Afghan citizens in a "propaganda" campaign against Taiwan.
A Chinese commentator said the regulations are designed to include all of the Chinese-claimed territories in the East and South China seas.
The talks are set for Friday and were confirmed less than a week after reports said Japan and Taiwan's ruling parties were hoping to hold a bilateral dialogue.
Taiwan's president made the remarks during a visit to the island's air force missile command headquarters on Monday.
The barb comes after a state-run paper in China suggested the U.S. withdrawal from Afghanistan was an "omen" of Taiwan's fate.
A Taiwanese official in charge of relations with China said Communist Party leader Xi Jinping is not displaying particular urgency in wanting to resolve the issue surrounding Taiwan's status.
China's Foreign Ministry spokesperson Hua Chunying urged Japan on Thursday to reconsider its arrangements with the Chinese-claimed island.
Laying the foundations of Taiwan's security is the "mission of our times," Tsai Ing-wen told her party on Wednesday.
The semi-official dialogue will mark the first-ever security talks between representatives from Japan and Taiwan.
China's state-owned rail operator has denied the report, declaring that freight transportation between China and Lithuania is running normally.
Taiwan's Defense Ministry reported around 380 sorties by Chinese military aircraft near Taiwan throughout 2020. That figure was matched and broken this week, with over four months left in the year.
The Global Times accused Senator John Cornyn of "testing" China with a now-deleted tweet mistakenly saying there were 30,000 U.S. troops stationed in Taiwan.
People's Liberation Army spokesperson said warplanes and warships were deployed around southern Taiwan for a combined arms exercise on Tuesday.
Senator John Cornyn (R-TX) tweeted out numbers of American troops in different locations, comparing them to Afghanistan.
Premier Su Tseng-chang said the Taiwanese government fears neither death nor imprisonment in the face of potential "annexation" by China.
"Some historians also point out that abandoning allies to protect U.S. interests is an inherent flaw that has been deeply rooted in the U.S. since the founding of the country," the editorial said.
As the Taiwanese people's pursuit of a separate national identity continues to grow stronger, Beijing will face an increasingly uphill battle in its quest to unify Taiwan with the mainland.
Beijing's use of military aircraft to put pressure on Taiwan has decreased since record-breaking incursions were recorded in April.
Described by the Biden administration as a "vibrant democracy," Taiwan is hoping to take part in the two-day virtual Summit for Democracy in December.
China's state-owned Global Times has continued its campaign against Lithuania following a decision to allow a de facto Taiwan embassy in Vilnius.
In June, U.S. lawmakers flew covertly to Taiwan from a military base in South Korea. The politically sensitive visit boosted morale on the island during a COVID-19 outbreak and a vaccine shortage.
Ship-tracking software showed Taiwan Coast Guard vessels sailing into the Pacific on Tuesday and Wednesday, but no U.S. Coast Guard ships were detected nearby.
Hu Xijin of the Global Times criticized Lithuania on social media before penning an editorial about the Baltic state's refusal to acquiesce to China's demands.
China said Tuesday it was a response to Lithuania's decision to allow the opening of a representative office in Vilnius under the name "Taiwan."
The former secretary of state also lamented what he perceived as the Biden administration's lack of pressure on China over Taiwan.