FILE - In this April 13, 2018, file photo, Taiwanese F-16 jet fighters fly in close formation during a navy exercise at Suao naval station in Yilan County, northeastern Taiwan. China demanded Tuesday, Sept. 25, 2018, that the U.S. cancel a $330 million sale of military equipment to Taiwan, warning of "severe damage" to bilateral relations and cooperation if Washington fails to comply. The Trump administration said Monday, Sept. 24, that it had approved the sale of spare parts and related support for Taiwan's F-16 fighters and other military aircraft. (AP Photo/Chiang Ying-ying, File)

FILE - In this April 13, 2018, file photo, Taiwanese F-16 jet fighters fly in close formation during a navy exercise at Suao naval station in Yilan County, northeastern Taiwan. China demanded Tuesday, Sept. 25, 2018, that the U.S. cancel a $330 million sale of military equipment to Taiwan, warning of "severe damage" to bilateral relations and cooperation if Washington fails to comply. The Trump administration said Monday, Sept. 24, that it had approved the sale of spare parts and related support for Taiwan's F-16 fighters and other military aircraft. (AP Photo/Chiang Ying-ying, File)

BEIJING (AP) — China on Tuesday demanded the U.S. cancel a $330 million sale of military equipment to Taiwan, warning of “severe damage” to bilateral relations and mutual cooperation if Washington fails to comply.

Foreign ministry spokesman Geng Shuang told reporters at a regular briefing that the sale violated international law and the “basic norms governing international relations.”

It was unclear what aspect of international law Geng was referring to.

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“We urge the U.S. side to ... immediately cancel this arms sale plan, and stop military contact with Taiwan so as to avoid severe damage to China-U.S. ties, peace and stability in the Taiwan Strait and bilateral cooperation in major fields,” Geng said.

China’s defense ministry issued a similar statement, saying the sale had “interfered in China’s internal affairs and harmed China’s sovereignty and security interests.”

Washington has no official relations with Taiwan’s democratically elected government but is obliged by U.S. law to see that it has the means to defend itself.

The Trump administration said Monday that it had approved the sale of spare parts and related support for Taiwan’s U.S.-made F-16 fighters and other military aircraft.

The U.S. said the sale will improve Taiwan’s ability to defend itself without altering the basic military balance in Asia, where Washington and Beijing are increasingly competing for dominance. China as a principle opposes all U.S. military sales to Taiwan, which split with the mainland in 1949 but which Beijing continues to claim as part of its territory and threatens to invade to bring under its control.

The arms sale coincides with a U.S. decision to issue a visa ban and assets freeze on China’s Equipment Development Department and its director, Li Shangfu, over the purchase from Russia of Su-35 combat aircraft in 2017 and S-400 surface-to-air missile system-related equipment this year.

China’s purchase of the weapons from Rosoboronexport, Russia’s main arms exporter, violated a 2017 law intended to punish the government of Russian President Vladimir Putin for interfering in U.S. elections and other activities.

In response, China summoned the American ambassador and defense attache to deliver a protest and recalled its navy commander from a U.S. trip. China’s Defense Ministry said the U.S. had no right to interfere in Chinese military cooperation with Russia and demanded the sanctions be revoked.

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The Kremlin dismissed the sanctions as an “unfair” move to undercut Russia as a major arms exporter.

In a further sign of retaliation, China turned down a request for an October port call in Hong Kong by the U.S. Navy’s amphibious assault ship USS Wasp, according to the U.S. Consulate in the semi-autonomous Chinese territory. China last denied such a visit in 2016 amid a spike in tensions between the sides over the disputed South China Sea.

Geng, the foreign ministry spokesman, declined to give details, saying only that such requests were handled “case-by-case in accordance with the doctrine of sovereignty and specific situation.”