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China-Britain relations expected to face further challenges no matter who replaces Boris Johnson as prime minister

The departure of British Prime Minister Boris Johnson, who has emerged as a leading hawk on China and Russia among Western leaders, may lead to a period of uncertainties in China-UK relations, diplomatic observers said.

Right after Johnson announced his resignation on Thursday as leader of the Conservative Party following a cabinet mutiny over a series of bruising scandals, it grabbed headlines in China's state-controlled media and social media, with many gloating about his dramatic fall from grace.

China's foreign ministry refused to comment directly on Johnson's decision to resign, saying it was "an internal British matter". Instead, spokesman Zhao Lijian sent a message to his successor, who is likely to be chosen in a Conservative Party leadership contest that may not finish until early October.

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"No matter how British politics changes, we hope that the British side will take the long-term and overall situation into consideration, work with the Chinese side halfway, and promote the sustainable and stable development of bilateral relations," he said on Friday.

However, with a hardening of negative perceptions of China in Britain, Chinese observers have cautioned against hopes that the rapidly deteriorating ties between Beijing and London will see a major turnaround under Johnson's successor.

They said Johnson, who announced he would stay on as prime minister until a successor was named, had left a mixed legacy on foreign policy, especially when it came to China.

Pang Zhongying, an specialist in international affairs from Sichuan University, described Johnson as a capable leader who, despite being erratic and divisive, had helped Britain regain prominence with his fervent support for Ukraine against Russia and shrewd diplomacy on the world stage.

He noted that after Brexit, Britain had been playing "an outsized role" in many multilateral institutions, such as Nato, the Group of 7, the Group of 20 and Aukus, the three-way security pact between the United States, Britain and Australia.

The hosting of the United Nations climate summit in Glasgow last year and Britain's application to join the 11-nation Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP) trade bloc have helped lift London's international standing, according to Pang.