BEIJING (AP) — China on Thursday denounced a decision by the United States to upgrade Taiwan's F-16 fighter jets, summoning the U.S. ambassador and warning that relations overall and recently warming military ties will suffer.

The Chinese Foreign Ministry said in a statement on its website that Vice Minister Zhang Zhijun summoned U.S. Ambassador Gary Locke in Beijing to deliver the protest.

"The wrongdoing by the U.S. side will inevitably undermine bilateral relations as well as exchanges and cooperation in military and security areas," Zhang told Locke, according to the statement.

China reacts angrily to any foreign military sales to Taiwan, because it regards the democratic island of 23 million people as part of its territory, and sees the arms sales as undermining China's efforts to woo back the island.

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