WASHINGTON >> Face to face, President Joe Biden’s national security adviser warned a top Chinese official today about China’s support for Russia in the Ukrainian invasion, even as the Kremlin denied reports it had requested Chinese military equipment to use in the war.

U.S. adviser Jake Sullivan and senior Chinese foreign policy adviser Yang Jiechi met in Rome, with the Biden administration increasingly concerned that China is using the Ukraine war to advance Beijing’s long-term interest in its competition with the United States.

Sullivan was seeking clarity on Beijing’s posture and was warning the Chinese anew that assistance for Russia — including helping it avert sanctions imposed by the U.S. and Western allies — would be costly for them.

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“The national security adviser and our delegation raised directly and very clearly our concerns about the PRC’s support to Russia in the wake of the invasion, and the implications that any such support would have for the PRC’s relationship not only with us, but for its relationships around the world,” said State Department spokesman Ned Price, using the initials for the People’s Republic of China.

Meanwhile, two administration officials said the U.S. had determined that China had signaled to Russia that it would be willing to provide both military support for the campaign in Ukraine and financial backing to help stave off the impact of severe sanctions imposed by the West. The officials said that assessment had been relayed to Western and Asian allies and partners earlier Monday.

“Moscow has received a positive response from Beijing,” said one official, describing a diplomatic cable sent to U.S. embassies asking for them to inform their host governments of the information. The officials spoke on the condition of anonymity to discuss the sensitive information.

Sullivan made clear during an “intense” seven-hour meeting that the Biden administration has deep concerns about China’s alignment with Russia at this time, White House press secretary Jen Psaki said.

Psaki declined to comment on whether the U.S. believes China has already provided the Russians with military, economic or other assistance.

In advance of the talks, Sullivan bluntly warned China to avoid helping Russia evade punishment from global sanctions that have hammered the Russian economy. “We will not allow that to go forward,” he said. Russia, however, on Monday denied it needed China’s help.

“No, Russia has its own potential to continue the operation, which, as we have said, is unfolding in accordance with the plan and will be completed on time and in full,” said Dmitry Peskov, President Vladimir Putin’s spokesman.

Meanwhile, White House officials are discussing the possibility of Biden traveling to Europe to meet with allies for in-person talks about the crisis in Ukraine, according to three U.S. officials. The officials, who were not authorized to comment publicly and spoke on the condition of anonymity, said the trip hasn’t been finalized. One possibility is a visit to NATO headquarters in Brussels on March 24 with other potential stops in Europe, according to one of the officials.

The prospect of China offering Russia financial help is one of several concerns for Biden. A U.S. official said that in recent days, Russia has requested support from China, including military equipment, to press forward in its ongoing war with Ukraine. The official, who spoke on condition of anonymity to discuss sensitive matters, did not provide details on the scope of the request.

The Russians have seen significant losses of tanks, helicopters and other materiel since the start of the war more than two weeks ago. Ukraine, while overmatched by Russian forces, is well-equipped with anti-tank and anti-aircraft missiles. Russia’s and China’s weapons systems have limited interoperability, and it’s not clear what weapons China has that Russia would be in short supply of.

The Biden administration is also accusing China of spreading Russian disinformation that could be a pretext for Putin’s forces to attack Ukraine with chemical or biological weapons.

Russia’s invasion of Ukraine has put China in a delicate spot with two of its biggest trading partners: the U.S. and European Union. China needs access to those markets, yet it also has shown support for Moscow, joining with Russia in declaring a friendship with “no limits.”

Asked at a daily briefing about the reported Russian request for assistance, Chinese Foreign Ministry spokesperson Zhao Lijian said: “The U.S. has been spreading disinformation targeting China recently over the Ukraine issue. It is malicious.”

“What is pressing now is that all parties should exercise restraint and strive to cool down the situation, rather than fueling the tension,” Zhao told reporters. “We should promote diplomatic settlements instead of further escalating the situation.”

Biden administration officials say Beijing is spreading false Russian claims that Ukraine was running chemical and biological weapons labs with U.S. support. They say China is effectively providing cover if Russia moves ahead with a biological or chemical weapons attack on Ukrainians.

When Russia starts accusing other countries of preparing to launch biological or chemical attacks, Sullivan said Sunday, “it’s a good tell that they may be on the cusp of doing it themselves.”

Pentagon spokesman John Kirby, on ABC’s “This Week,” said “we haven’t seen anything that indicates some sort of imminent chemical or biological attack right now, but we’re watching this very, very closely.”

The striking U.S. accusations about Russian disinformation and Chinese complicity came after Russian Foreign Ministry spokeswoman Maria Zakharova alleged with no evidence that the U.S. was financing Ukrainian chemical and biological weapons labs.

The Russian claim was echoed by Chinese foreign ministry spokesman Zhao, who claimed there were 26 bio-labs and related facilities in “which the U.S. Department of Defense has absolute control.” The United Nations has said it has received no information backing up such accusations.

There is growing concern inside the White House that China is aligning itself with Russia on the Ukraine war in hopes it will advance Beijing’s “vision of the world order” in the long term, according to a person familiar with the administration view who spoke on condition of anonymity because the official wasn’t authorized to comment publicly.

China has been one of few countries to avoid criticizing the Russians for its invasion of Ukraine. China’s leader Xi Jinping hosted Putin for the opening of the Winter Olympics in Beijing, just three weeks before Russia invaded on Feb. 24. During Putin’s visit, the two leaders issued a 5,000-word statement declaring limitless “friendship.”

The Chinese abstained on U.N. votes censuring Russia and has criticized economic sanctions against Moscow. But questions remain over how far Beijing will go to alienate the West and put its own economy at risk.

Spanish Foreign Minister José Manuel Albares said Monday that he had asked his Chinese counterpart Wang Yi to use Beijing’s influence over Moscow to end the war.

“We are at a historical moment that requires responsibility and vision of all world leaders,” Albares told Wang during a telephone conversation on Monday, according to a statement from the Spanish ministry.