Russia and the US disagreed on Thursday over whether US President Donald Trump plans to meet his Russian counterpart Vladimir Putin at an Asia-Pacific summit in Vietnam.
Kremlin aide Yury Ushakov told Russian news agencies the meeting "will be on November 10" with the exact time still being discussed.
But in comments in Beijing, where Mr Trump is on a state visit, US Secretary of State Rex Tillerson said no decision had been taken on a potential meeting.
"There has never been an agreement, certainly not to a formal bilat," he said, adding the "question is whether we have got sufficient substance" to talk about.
"If we're going to have a meeting, let's make sure it's a meaningful meeting," he said, mentioning ongoing discussions on the situations in Syria and Ukraine.
Both leaders will attend the Asia-Pacific Economic Cooperation summit in the Vietnamese city of Danang in the coming days.
The pair last met at the G20 summit in Germany in July.
On Sunday Mr Trump said he thinks "it's expected we'll meet with [Mr] Putin" to discuss North Korea.
In Beijing, Mr Trump appealed to both China and Russia to act quickly to resolve the North Korean nuclear crisis.
"I'm also calling on Russia to help rein in this potentially very tragic situation," he said.
Relations between Moscow and Washington have plummeted as a US probe has accused Trump's former campaign aides of secretly meeting Kremlin-connected officials.
Russia has vehemently denied allegations of interfering in the US election last year that brought Trump to power