On Sunday, prominent U.S. officials cautioned China against providing assistance to Russia’s aggressive assault on Ukraine, with one senator characterizing such action as exceedingly foolish.

The warnings were issued following a meeting between U.S. Secretary of State Antony Blinken and his Chinese counterpart, which marked the first such meeting since the U.S. intercepted a suspected Chinese surveillance balloon that traversed the nation.

According to Blinken, during their discussion at the Munich Security Conference, China’s top foreign minister, Wang Yi, did not express remorse for the incursion.

“What I can also tell you is this was an opportunity to speak very clearly and very directly about the fact that China sent a surveillance balloon over our territory, violating our sovereignty, violating international law,” the secretary of state said on ABC’s “This Week.”

“And I told him quite simply that that was unacceptable and can never happen again,” he completed.

The balloon was brought down by U.S. fighter jets off the coast of South Carolina earlier this month, despite Beijing’s denial of its involvement in espionage activities.

Several days after, the U.S. shot down additional objects from the sky, but officials admitted that the identity of those objects may remain unknown.

On Sunday, Blinken stated that there is a possibility of China offering deadly aid to Russia in their attack on Ukraine.

“It would have serious consequences in our own relationship, something that we do not need on top of the balloon incident that China’s engaged in,” he said on NBC’s “Meet the Press.”

Senator Lindsey Graham of South Carolina, a Republican, was far less tactful.

“If you jump on the Putin train now, you’re dumber than dirt,” he said on ABC’s “This Week,” referring to Russian President Vladimir Putin.

“It would be like buying a ticket on the Titanic after you saw the movie,” Graham continued. “Don’t do this. The most catastrophic thing that could happen to U.S.-China relationship, in my opinion, is for China to … start to give lethal weapons to Putin in this crime against humanity.”

During an appearance on CNN’s “State of the Union” program on Sunday, Linda Thomas-Greenfield, the U.S. Ambassador to the United Nations, expressed similar sentiments as Blinken.

“We’re not going to advance and announce what we’re planning to do, but we made clear to the Chinese that there will be consequences should they make that unfortunate decision,” she said of the prospect of Chinese support of Russia’s invasion.