Kyiv and Moscow resumed talks on the war in Ukraine on Tuesday after a pause on Monday, Ukrainian negotiator Mykhailo Podolyak said.
"Consultations on the main negotiation platform renewed. General regulation matters, ceasefire, withdrawal of troops from the territory of the country," he wrote on Twitter.
China denied on Tuesday claims by US officials that Russia had sought military assistance in Ukraine and accused Washington of spreading "malicious disinformation" that risked escalating the conflict.
"The US has repeatedly spread malicious disinformation against China on the Ukraine issue," the Chinese embassy in London told Reuters in a statement.
"China has been playing a constructive role in promoting peace talks," it added.
"The top priority now is to ease the situation, instead of adding fuel to the fire, and work for diplomatic settlement rather than further escalate the situation."
Britain says China should not support Russia in its invasion of Ukraine, junior foreign office minister James Cleverly said on Tuesday.
"We continue to call upon China and indeed all countries to cease any support they may have to Russia," Cleverly told BBC Television. "We want to build as broad a coalition of opposition to Russia as possible so of course we will have those conversations with the Chinese."
Several US officials said Russia had asked China for military equipment after its Feb. 24 invasion of Ukraine, sparking concern in the White House that Beijing might undermine Western efforts to help Ukrainian forces defend their country.
The Kremlin denied any such request had been made.
However, Russian aviation authorities later fired an official who said last week that China had indeed refused a request to supply Russian airlines with aircraft parts in the wake of Western sanctions, the Kommersant newspaper reported on Tuesday, citing sources and the official.
Valery Kudinov, an official at Russia's Federal Air Transport Agency (Rosaviatsia) responsible for maintaining airplane airworthiness, said Russia was in talks to source parts from countries including Turkey and India after a failed attempt to obtain them from China.
An industry source confirmed to Reuters that Kudinov had been sacked, adding that he lost his job because of his public statements about China. Rosaviatsia declined to comment.
Russian newspaper Kommersant cited Kudinov as saying that he had been fired for disclosing information under a federal law governing how civil servants must behave.