Relatives of victims of the Srebrenica massacre are suing the Netherlands at the European Court of Human Rights in Strasbourg.
Some 8,000 Muslim boys and men were killed by Serb forces in July 1995 in an area protected by Dutch UN peacekeepers that the United Nations had declared a "safe haven."
The victims' group is suing the Netherlands over a decision by that country's supreme court that the United Nations could not be prosecuted by a national court.
The victims' group wants that ruling overturned by the Strasbourg court.
"The denial of justice is even more horrendous because the United Nations is denying them all legal recourse," the Van Diepen-Van der Kroef law firm said in a statement.
Last year, a Dutch court found the Dutch state responsible for the deaths of three victims, opening the way for compensation claims over the failed peacekeeping mission.
Based on AP and Reuters reporting