The two boys disappeared as their group took part in a supervised walk in the grounds of the kindergarten in the city of Magnitogorsk in the Urals region.
Chelyabinsk regional interior ministry confirmed the boys’ escape from kindergarten.
“We don’t have any details yet, we can only confirm the fact itself,” a spokesman said, adding that the incident took place several days ago.
After reaching freedom, the boys walked two kilometres to a car showroom selling luxury cars.
A female driver noticed the unaccompanied children and asked them what they were doing. They told her they had come from their kindergarten to buy a Jaguar but did not have any money.
She put them in her car and drove them to a police station.
The boys had prepared their escape for several days, digging a hole under a fence using spades from the sand pit, Komsomolskaya Pravda reported, citing kindergarten staff.