According to the CNN broadcaster, the P-8A Poseidon plane made a reconnaissance flight over the Taiwan Strait on Friday, Sputnik reported.
"The US actions pose an intentional interference and destabilization of the situation in the region, harm peace and stability in the Taiwan Strait.
China is firmly opposing that," a spokesperson for the Chinese Eastern Theater Command said.
He added that the Eastern Theater Command was permanently on a high alert to protect the national sovereignty and territorial integrity.