Kyiv says Russian troops have moved out of a 10-kilometer zone along Ukraine’s border just days before presidential elections.
But Ukrainian authorities stopped short of confirming Moscow's claims that a full withdrawal has been made.
The Pentagon said on May 20 that it had seen no evidence Russia has withdrawn its 40,000 troops.
Ahead of the May 25 presidential election, Ukrainian authorities are scheduled to hold a new round of "national dialogue" today aimed at ending an insurgency by pro-Russian separatists who control dozens of cities and towns in eastern Ukraine.
To recall, Russian President Vladimir Putin has ordered military forces that took part in drills in three regions bordering Ukraine to return to their home bases.
In a statement released on May 19, the Kremlin said that troops involved in "planned spring" exercises in the Rostov, Belgorod, and Bryansk regions had been ordered back to their barracks.