BEIJING — The United Kingdom’s top diplomat raised concerns about China’s support of Russia in its war in Ukraine on Friday, urging his Chinese counterpart to prevent Chinese firms from supplying to Moscow’s military.

British Foreign Secretary David Lammy made the comments as he made his first visit by a Cabinet minister to China since the Labor government took control in July. He met with Vice Premier Ding Xuexiang on Friday and held talks with Foreign Minister Wang Yi later the same day.

The two-day trip is an attempt to reset ties with Beijing after relations turned frosty in recent years over spying allegations; China’s support for Russia in the war in Ukraine; and a crackdown on civil liberties in Hong Kong, a former British colony.

While London stressed that engagement with China was “pragmatic and necessary,” officials said Lammy raised thorny issues, including Russia and human rights concerns in Hong Kong and China’s far-western Xinjiang province.

Lammy “stated how both the UK and China have a shared interest in European peace and ending the war. He reaffirmed that concerns over China’s supply of equipment to Russia’s military-industrial complex risks damaging China’s relationships with Europe whilst helping to sustain Russia’s war,” the Foreign Office said in a statement after the meeting.

Lammy urged Wang to “take all measures to investigate and to prevent Chinese companies from supplying Russia’s military,” the statement said, adding the two sides agreed to continue discussions on this and other geopolitical issues such as the conflict in the Middle East.

The United States sanctioned two Chinese companies on Thursday for allegedly helping Russia build long-range attack drones used in the war in Ukraine. The Chinese Embassy in Washington, D.C., said the allegations were false.

Lammy also raised “serious concerns” about the implementation of a sweeping national security law in Hong Kong and called for the release of Hong Kong publisher and activist Jimmy Lai.

Lai, 76, has been in custody since December 2020 and will testify in November for his defense in a landmark national security trial. He has British citizenship, and his legal team has been pressing British authorities to do more to help him.

Before traveling to China, Lammy said it was important to speak “candidly” about “both areas of contention, as well as areas for cooperation in the UK’s national interest.”

Human rights groups have demanded that Lammy press the Chinese government over its crackdowns on dissent in Hong Kong, Xinjiang and Tibet.

Wang said Taiwan and Hong Kong affairs were all “China’s internal matters” and that “not interfering in internal matters was a basic premise of international relations,” a readout from China’s Foreign Ministry said.

He said China and the UK should boost economic cooperation and find areas of consensus in global politics, despite areas of deep disagreement. The statement did not state particulars of China’s response on the country’s support of Russia in the war.

“China is willing to work with all countries, including the UK … to seek peace for the world and pursue development for mankind,” Wang said.

Lammy will also visit the eastern city of Shanghai, where he will meet with British business leaders, the Foreign Office said. China, including Hong Kong, is the UK’s fourth-largest trading partner.

The last British foreign secretary to visit China was James Cleverly in 2023, when he underlined the importance of maintaining regular dialogue with Beijing despite differences.