The military graves are owned by the Kingdom of the Netherlands. All manner of constructions (tombstones and obelisk) are also state property.
Management and preservation are the responsibility of the Oorlogsgravenstichting, with the support of the Embassy of the Russian Federation in the Netherlands.
The Stichting Russisch Ereveld is a non-profit organization that aims at informing relatives, arranging visits to the graves and keeping the memories of the soldiers alive.
Read more here about the status of the Soviet War Cemetery.