Turkey's prime minister accused the European Union of treating Turkey unfairly a day after EU ministers agreed on a partial freeze of Ankara's membership.
"The decision of the EU (ministers) is an injustice against Turkey," Recep Tayyip Erdogan said in an address to members of his ruling party in parliament.
"I have to say that Turkey-EU relations are going through a serious test, despite all our efforts to open up the blockage," he said.
The EU foreign ministers decided to freeze eight of the 35 "chapters" or policy areas into which the negotiations are divided.
The move came to penalize Turkey for failing to meet a treaty obligation to open its ports and airports to traffic from Cyprus, one of the 10 new members, which joined the EU in 2004.
According to Erdogan EU was unable to resolve the EU dispute and said the United Nations must intervene.
"The European Union will never be a site for a comprehensive solution to Cyprus. We are on the side of a just and lasting solution from the United Nations."
"In the period in front of us, we know very well what we have to do - we have to carry out our reforms with the same decisiveness."