China has warned airlines to avoid the airspace near Taiwan as Beijing steps up military exercises over Pelosi's visit

• China has warned airlines to avoid flying in the airspace around Taiwan, Bloomberg reported.
• It comes amid US House Speaker Nancy Pelosi's controversial visit to Taiwan.

China has warned airlines to avoid flying in the airspace around Taiwan as Beijing steps up military exercises around the island, Bloomberg reported, citing carriers and a Korean transport ministry official. Beijing highlighted several six "danger zones" to the airlines, per the media outlet.

The warning comes amid US House Speaker Nancy Pelosi's controversial visit to Taiwan. After she landed, China announced it would hold military exercises — including live drills — around Taiwan from Thursday to Sunday, state-run Xinhua News Agency wrote in an announcement authorized by the Chinese defense ministry.

Cathay Pacific told Insider it's monitoring developments in the region "very closely." "Our flights currently avoid going through the designated airspace zones around the Taiwan region," Hong Kong the carrier told Insider. "This may potentially lead to more flying time for some flights and we appreciate our customers' understanding."

Korean Air told Bloomberg it's planning to re-route some flights to South Asia to avoid Taiwanese airspace over the next few days. The South Korean carrier did not immediately to a request from Insider for comment.

The announcement of Chinese military exercises and heightened cross-straits tensions led to intense speculation in Taiwan over whether flight disruptions in Taiwan's airports this week are due to the drills.

Wednesday alone saw more than 30 flight cancellations from Taiwan's Taoyuan International Airport. Another 40 flights scheduled for Thursday have also been cancelled, according to Taiwan's United Daily News.

The airport played down the speculation, telling the news outlet that the cancellations have nothing to do with China's military exercises and that operations are running normally. Taiwan's borders are still largely closed due to the COVID-19 pandemic.