Prospects for a renewed high-level military dialogue between China and the US remain dim, with Beijing saying their defense chiefs will not hold a bilateral meeting while both are attending a weekend security conference in Singapore.

Foreign Ministry spokesperson Mao Ning on Tuesday blamed the US, saying Washington should “earnestly respect China’s sovereignty and security interests and concerns, immediately correct the wrongdoing, show sincerity, and create the necessary atmosphere and conditions for dialogue and communication between the two militaries.” Mao gave no details, but tensions between the sides have spiked over Washington’s military support and sales of defensive weapons to self-governing Taiwan, China’s assertions of sovereignty to the contested South China Sea and its flying of a suspected spy balloon over the US.

US Defence Secretary Lloyd Austin is scheduled to address the Shangri-La Dialogue on Saturday, while Chinese Defense Minister Gen. Li Shangfu will speak at the gathering on Sunday.

Austin met privately with Li’s predecessor, Wei Fenghe, at last year’s Shangri-La Dialogue, which appeared to do little to smooth relations between the sides.

In his address to the forum, Wei accused the US of seeking to contain China’s development and threatening to assert its claim to Taiwan by military force.

Chinese leader Xi Jinping and U.S. President Joe Biden met on the sidelines of the Group of 20 meeting of large economies in November in Indonesia, but contacts have proceeded only sporadically since then, with only side meetings on neutral territory.

Secretary of State Antony Blinken canceled a visit to Beijing in February after the US shot down a Chinese spy balloon that had crossed the United States.

He later met with the Communist Party’s senior foreign affairs adviser Wang Yi in Austria.

China refused to take a phone call from Austin to discuss the balloon issue, the Pentagon said.