China has assured US it will not provide lethal aid to Russia, top US diplomat says

US Secretary of State Antony Blinken speaks during a press conference at the Beijing American Center of the US Embassy in Beijing, China, on June 19. Pedro Pardo/AFP/Getty Images

China has assured that it has not and will not provide lethal aid to Russia, but the United States remains concerned that Chinese companies may do so, US Secretary of State Antony Blinken said Monday.

Blinked said the assurance is appreciated and there is no evidence to contradict them.

"What we do have ongoing concerns about, though, are Chinese firms — companies that may be providing technology that Russia can use to advance its aggression in Ukraine. And we've asked the Chinese government to be very vigilant about that," Blinken said.

Some context: China's assurance was not newly made to him during his visit, Blinken said in response to a question from CNN's Kylie Atwood. "This is something that China has said in recent weeks, and has repeatedly said not only to us, but to many other countries that have raised this concern."