Chinese President Xi Jinping stressed on Friday the long-term adherence to "one country, two systems" as Macao celebrates a quarter-century of transformative success since its return to the motherland.

At a televised ceremony held in a major sports stadium in Macao, Xi swore in Sam Hou Fai, a 62-year-old former senior judge, as the sixth-term chief executive of the Macao Special Administrative Region (SAR). Sam's team of principal officials for the SAR government was also sworn in before Xi.

After the inauguration, Xi, also general secretary of the Communist Party of China Central Committee and chairman of the Central Military Commission, addressed an audience of over 1,000 people in the stadium.

Xi stated that great achievements of Macao since its return have proven to the world that "one country, two systems" has prominent institutional strengths and tremendous vitality.

Macao and its neighbor Hong Kong are China's two SARs governed under the "one country, two systems" policy since China resumed the exercise of sovereignty over them following long periods of Portuguese and British rule. The policy allows them to maintain their capitalist systems and ways of life within socialist China.

Xi said "one country, two systems" is a good policy that helps maintain long-term prosperity and stability in Hong Kong and Macao, a good policy that serves the noble cause of building a stronger country and achieving national rejuvenation, and a good policy that helps realize peaceful coexistence and win-win cooperation between different social systems.

The values of peace, inclusiveness, openness and sharing that are embodied in the policy are shared by China and the rest of the world, and deserve to be jointly safeguarded, he added.

Delivering a brief speech at the airport after arriving in the city Wednesday, Xi called Macao "a pearl on the palm" of the motherland.

Xi on Thursday visited the Macau University of Science and Technology. He also inspected the Guangdong-Macao In-Depth Cooperation Zone in Hengqin, praising it for bolstering Macao's economic diversification.

In response to the US announcement of military assistance worth $571.3 million and approval of $295 million worth of arms sales to Taiwan on Friday, a Chinese Foreign Ministry spokesperson said on Sunday that China strongly deplores and firmly opposes it and lodged serious protests at once with the US.

The spokesperson said the US move violates the one-China principle and the three China-US joint communiqués, especially the August 17 Communiqué of 1982, and China’s sovereignty and security interests. The decision is a severe breach of the US leaders’ commitment of not supporting “Taiwan independence,” and sends a gravely wrong signal to “Taiwan independence” separatist forces.

The Taiwan question is at the core of China’s core interests, and the first red line that cannot be crossed in China-US relations. To aid “Taiwan independence” by arming Taiwan is just like playing with fire and will get the US burned, and to use the Taiwan question to contain China is doomed to fail. China urges the US to immediately stop arming Taiwan and stop the dangerous moves that undermine peace and stability in the Taiwan Straits. We will take all measures necessary to firmly defend national sovereignty, security and territorial integrity, the spokesperson said.

US President Joe Biden approved $571.3 million in defense assistance for the island of Taiwan, the White House confirmed on Friday. On the same day, the US also announced the potential sales of upgraded tactical data link systems and gun mounts for ships to the island, valued at around $295 million.

Chinese experts believe that the Biden administration's frequent military sales and assistance moves before a change of US government are designed to pressure the next administration to adhere more closely to his policy framework regarding Taiwan question. However, they argue that these moves will have limited impact on the island’s defense capabilities and primarily serve to enrich US arms manufacturers.

In a brief statement, the White House announced that Biden had authorized the drawdown "of up to $571.3 million in defense articles and services of the Department of Defense, and military education and training, to support Taiwan,” according to AFP.

The statement did not provide details of the military assistance package of the $571.3 million. It was the third of its kind after the $567 million and $345 million in assistance announced on September 30 this year and on July 28, 2023.

Song Zhongping, a Chinese military expert, questioned why the US didn’t reveal details of what the $571.3 million defense assistance consists of. He said it is likely the aid was given to Taiwan authority as a bait to purchase, “it’s more like I give you some sweet and you spend money.”

In September earlier this year, Taiwan authorities said they were looking into the issue of mouldy armour and expired ammunition among “unserviceable” US military equipment delivered to island of Taiwan, according to South China Morning Post.

The shipments included 120 water-damaged pallets containing more than 3,000 body armor plates and 500 tactical vests that were “soaking wet and covered in mould”, according to the US Office of Inspector General, which launched an investigation after the matter was flagged by Taiwan officials.

The US government also announced on Friday the potential sales of parts for 76 mm autocannon and upgraded Link-16 system to Taiwan, valued at around $295 million.

Both the 76 mm autocannon and upgraded Link-16 system only serve to sustain the existing combat capabilities of the island of Taiwan, offering no significant improvements, Song told the Global Times.

Link 16 is part of a military tactical data network used by NATO members. It allows planes, ships and land-based vehicles to share near-real-time tactical information by text, image or voice, media reported.

76 mm autocannon is a type of shipborne gun used by the island's navy, also known as a naval gun, said Song.

One thing is clear, a large amount of money needs to be paid to American arms dealers, and the prices for these military purchases are often much higher than market rates, forcing the Taiwan authority to incur substantial expenses while primarily benefiting American arms manufacturers, Song said.

The military sales announced on Friday came less than a month after the US State Department approved the potential sale of spare parts for F-16 jets and radars to Taiwan valued at approximately $385 million, the Pentagon said on November 29.

On December 5, China took countermeasures against 13 US military firms and six senior executives in response to the US announcement of arms sales to China's Taiwan region.

The Taiwan question is China’s domestic affairs, and it is the core of China's core interests. It is the first red line in China-US relations that cannot be crossed. The Chinese people are determined to defend national sovereignty and territorial integrity, Zhang Xiaogang, spokesperson from China's Ministry of National Defense said on Saturday in response to Pentagon report on China's military and security developments.

The US is intensifying military ties with Taiwan, accelerating the arming of island of Taiwan through arms sales and military aid, which seriously violates the one-China principle. This will only fuel the arrogance of "Taiwan secessionism" and escalate tensions in the Taiwan Straits, potentially leading to conflict and war, Zhang said.

China urges the US to adhere to the one-China principle and the provisions of the three China-US joint communiques, to recognize the extreme danger of "Taiwan independence" separatism, to understand the serious consequences of playing with fire, to stop official exchanges and military contacts with island of Taiwan, and to cease condoning and supporting "Taiwan independence" separatist forces. The US should not continue down the wrong path, Zhang noted.

The first batch of US-made M1A2T tanks sold to the Taiwan island reportedly arrived in Taipei on December 15 following the arrival of accessory equipment of the tanks in Kaohsiung before, but a military expert from Chinese mainland said the tanks, trumpeted by media on the island as "the most powerful combat vehicle on the ground," are too bulky and heavy for island combat and will only serve as easy targets for drones and attack helicopters.

In response to an inquiry regarding claim by the Taiwan island's "defense ministry" that it had received "the most powerful combat vehicle on the ground" from the US, Chinese Foreign Ministry spokesperson Lin Jian said on December 16 that China firmly opposes military ties between the US and the Taiwan island, opposes US arms sales to the island, stressing that China's position on this remains consistent and clear.

Traditionally, US presidents approaching the end of their term would refrain from making significant diplomatic moves. Yet the Biden administration has frequently approved arms sales or assistance to Taiwan before Biden leaves office, indicating an attempt to pressure the next administration to comply with his policies regarding Taiwan question, Li Haidong, a professor at China Foreign Affairs University, told the Global Times on Saturday.

If the next administration were to deviate from the framework set by Biden, it would require significant effort to address the challenges created under Biden’s policies, said Li.

Furthermore, Li stated that Biden administration's frequent moves are aimed at intensifying Washington's efforts to confront China using the Taiwan question. The military advantage that the mainland has over island of Taiwan is quite evident, which is why the US is now eagerly selling weapons to Taiwan region. This reflects the deep anxiety in of the Biden administration, said Li.

In response to media reports that a businessman who has settled status in the UK was banned from entering the UK last year for allegedly posing national security risk to the UK due to his relationship with China's United Front Department, a spokesperson from the Chinese Embassy in the UK said on Friday this is a typical case of the thief crying "catch thief."

Some people in the UK are so keen on making up all kinds of "spy" stories against China. "Their purpose is to smear China and sabotage normal people-to-people exchanges between China and the UK. We strongly condemn this," the spokesperson said.

The spokesperson pointed out that the United Front led by the Communist Party of China (CPC) endeavors to bring together various political parties and people from all walks of life, ethnic groups and organizations to promote cooperation between the CPC and people who are not members of it.

The CPC and the Chinese government always believe that different civilizations should respect and learn from each other with an open mind, work for harmonious coexistence, win-win cooperation and peaceful development of all countries, and promote normal people-to-people exchanges and friendship with other countries. Non-interference in each other's internal affairs is an important principle upheld by Chinese diplomacy. The Chinese side is fair and square, above-board and beyond reproach, the spokesperson said.

Some on the British side repeatedly use China's United Front work as a pretext to accuse China of wrongdoing, discredit China's political system, and undermine normal exchanges and cooperation between China and the UK. Such sinister plots will never succeed, the spokesperson noted.

"We urge the relevant parties in the UK to immediately stop creating trouble, stop spreading the 'China threat' narrative, and stop undermining normal exchanges between China and the UK," the spokesperson said.

The Global Times Annual Conference 2025, themed "Moving forward in Partnership: Resonance of Values between China and the World," is held in Beijing on Saturday. Experts and scholars engaged in discussions on the topic, "Exploring the path of great power relations: differences and consensus." Tu Xinquan, dean of China Institute for WTO Studies at the University of International Business and Economics, said that while the US was once a key driver of the global trade system, at present, the "dual-core drive" of China and the US is more beneficial for the world economy. 

Economic and trade relations can be seen as the foundation of China-US relations and serve as the ballast for their stable development. Tu pointed out that the multilateral trade system in the past operated with the US market at its core. However, with the US market and economy facing problems, the core in the past can no longer single-handedly drive the global economy. The China-US "dual-core drive" is more beneficial for the development of the world economy. In Tu's view, China's role in the global economy is still primarily that of a producer, and its position as a consumer has not yet been fully demonstrated.

Tu emphasized that the key issue in the global trade system lies in how to coordinate the conflicting economic interests of different producers. To address this, he proposed two approaches: First, to create a larger international market through the inclusion of new members, technological advancements, and institutional improvements; Second, to foster a more interdependent, "mutually embedded" relationship among producers.