G20 summit: Chinese and British leaders hold highest level meeting in years, amid claims spy was arrested at UK parliament

Chinese Premier Li Qiang on Sunday told British Prime Minister Rishi Sunak that both should handle their differences appropriately, be more tolerant and "respect each other's core interests and key concerns".

It is the two countries' highest-level meeting since 2018, marking another milestone after British Foreign Secretary James Cleverly's visit to China last month.

The meeting, on the sidelines of the Group of 20 summit in India's capital New Delhi, came hours after British media reported that two men had been arrested in the UK in March for allegedly spying for China.

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According to The Sunday Times newspaper, one of the men was a parliamentary researcher who had worked with senior MPs from Sunak's Conservative Party on foreign policy.

Sunak's office told journalists after the meeting that the prime minister had conveyed "significant concerns about Chinese interference in the UK's parliamentary democracy".

But he also said Britain values China's significant role in the global system, and pledged to cooperate with China on technology and in the fight against climate change, according to China's foreign ministry.

Li, the No 2 in China's political system, is attending the summit instead of President Xi Jinping, whose absence has not been explained.

He called for deeper cooperation with Britain in "trade, investment, green development, humanities and technology".

The meeting came amid a growing push across Europe and the United States to reduce economic dependency on China, but Li urged Britain to "maintain the multilateral trading system under the World Trade Organization", and "ensure a stable global industrial supply chain".

Li, whose primary responsibility is economic policy, added: "The two sides should appropriately handle disagreement, uphold the spirit of tolerance and mutual understanding, and respect each other's core interests and key concerns."

He also said: "Both China and the United Kingdom are advocates, participators and beneficiaries of free trade, and should jointly oppose the securitising and politicising of economic issues, and promote an open world economy."

London maintained a relatively hawkish stance toward Beijing, especially after it imposed the National Security Law on Hong Kong, its former colony, in 2020.