Meng Wanzhou, Huawei’s global chief financial officer, was arrested in Canada on Dec. 1 and faces extradition to the United States, which alleges that she covered up her company’s links to a firm that tried to sell equipment to Iran despite sanctions.

The executive is the daughter of the founder of Huawei.

If extradited to the United States, Meng would face charges of conspiracy to defraud multiple financial institutions, a Canadian court heard on Friday, with a maximum sentence of 30 years for each charge.

No decision was reached at the extradition hearing after nearly six hours of arguments and counter-arguments, and the hearing was adjourned until Monday.

In a short statement, China’s Foreign Ministry said that Vice Foreign Minister Le Yucheng had issued the warning to release Meng to Canada’s ambassador in Beijing, summoning him to lodge a “strong protest”, Reuters reported.

There was no immediate reaction from the office of Canadian Foreign Minister Chrystia Freeland on Saturday. When asked about the possible Chinese backlash after the arrest of Huawei’s CFO, Prime Minister Justin Trudeau told reporters on Friday that Canada has a very good relationship with Beijing.

Canada’s arrest of Meng at the request of the United States, while she was changing plane in Vancouver, was a serious breach of her lawful rights, Le said.

The move “ignored the law, was unreasonable” and was in its very nature “extremely nasty,” he added.

“China strongly urges the Canadian side to immediately release the detained person, and earnestly protect their lawful, legitimate rights, otherwise Canada must accept full responsibility for the serious consequences caused.”

The statement did not elaborate.

“There will probably be a deep freeze with the Chinese in high-level visits and exchanges,” David Mulroney, former Canadian ambassador to China, said on Friday.

Meng’s arrest was on the same day that US President Donald Trump met in Argentina with China’s Xi Jinping to look for ways to resolve an escalating trade war between the world’s two largest economies.