Russia's case that it is moving soldiers from the line with Ukraine is "bogus", as indicated by a senior US official, who added that an additional 7,000 soldiers have shown up lately.
The authority likewise said that Russia could send off a "bogus" appearance to attack Ukraine "all of a sudden".
Moscow says it is moving soldiers from the Ukrainian line after the finishing of military activities.
In any case, Western authorities say they have seen no proof to help the case.
It came hours after Ukrainian President Volodymyr Zelensky told the BBC: "We don't see any troop withdrawal yet, we just caught wind of it."
He was talking as Ukraine denoted a purported day of solidarity on Wednesday, with public blue and yellow banners raised all through the country.
President Zelensky proclaimed the enthusiastic occasion because of US knowledge reports that Russia could assault Ukraine around the same time.
Nato Secretary-General Jens Stoltenberg has additionally said there are no signs that Russian powers are de-raising, saying on Wednesday that the danger from Russia had turned into "another ordinary".
What is it and for what reason doesn't Russia trust it?
Talking at a culmination of Nato safeguard clergymen in Brussels, Mr Stoltenberg said the collusion was thinking about setting up new fight gatherings - the littlest sort of independent military units - in focal and south-eastern Europe.
He said this was essential for continuous measures to support European protection - on which $270bn (£199bn) had been spent starting around 2014 - in spite of the fact that he endeavored to promise Russia that Nato was not a danger.
France had proposed to lead one such fight bunch in Romania, he said.
Russia's unfamiliar service said it was "at this point not intrigued" in Mr Stoltenberg's assertions.
This was a dreary gauge for the future from Nato's secretary-general.
Jens Stoltenberg portrayed it as the most genuine security emergency in Europe since the finish of the Cold War. Also he conveyed clear that the intimidation hadn't disappeared.
Regardless of whether President Putin provide the request to assault, there are still signs this emergency will create a significantly longer shaded area.
Mr Stoltenberg said Russia's tactical development showed Moscow was ready to challenge European security with the utilisation of power.
That "new typical" could likewise mean Nato expanding its tactical stance. Mr Stoltenberg has entrusted Nato military organizers to take a gander at setting up new fight bunches on the union's eastern flank - in Romania and the Black Sea district.
Nonetheless, no official choice has yet been taken and Nato demands fortifications would simply be shipped off go about as an impediment.
Nato is as yet approaching Russia to participate in discourse to diminish pressures. However, on the off chance that tact doesn't work the risk is the two sides will wind up with their militaries communicating everything.
The wariness over Russia's asserted withdrawal was additionally reverberated in the UK. State leader Boris Johnson told the UN Secretary-General in a call there was "presently little proof of Russia separating", while his safeguard insight boss Lt-Gen Jim Hockenhull said that, in actuality, Russia was proceeding to develop its powers.
"This incorporates sightings of extra protected vehicles, helicopters and a field emergency clinic moving towards Ukraine's lines," he said. "Russia has the tactical mass set up to lead an intrusion of Ukraine."
On Wednesday, the US State Department cautioned that Russian authorities were establishing stories in the media pointed toward impacting popular assessment in case of an intrusion.
Representative Ned Price communicated worry at Mr Putin's case that "decimation" was occurring in eastern Ukraine.
In the mean time, Russian authorities said they were examining affirmed mass graves containing many regular people in the contention zone.
ON THE GROUND: Ukrainians careful about Russian cases of withdrawal
Investigation: Is Russia going to attack Ukraine?
EXPLAINER: Ukraine: How arranged is Russia for an assault?
Russia and Ukraine have profound social and memorable ties, and both were essential for the previous Soviet Union.
Russian President Vladimir Putin needs affirmations that Ukraine won't join Nato since he considers any extension of it to be a danger. Nato has dismissed that interest.
Recently, Mr Putin said that Russia didn't need war, however requested that the issue of Nato participation be tended to now, despite the fact that Ukraine is far from beginning an application to join the partnership.
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