Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. UN Security Council to Hold Closed-Door Meeting on Nagorno-Karabakh Conflict Tuesday VOA News The United Nations Security Council is expected to discuss the escalating fighting in the breakaway region of Nagorno-KarabakhlaterTuesday. Theclosed door meeting was requested by five European nations -- Britain, Belgium, Estonia, France and Germany -- as the fighting intensified Monday between forces of Armenia and Azerbaijan in the enclave. A spokesman for U.N. Secretary-General Antonio Guterres spoke to both President Ilham Aliyev of Azerbaijan and Armenian Prime Minister NikolPashinianand called for "an immediate stop to the fighting, a de-escalation of tension and a return to meaningful negotiations without preconditions or delay," according to the Associated Press. Officials in Nagorno-Karabakh say 58 soldiers have been killed since Sunday, when it says Azerbaijan launched an air and artillery attack. The region also reported two civilian deaths. There was no official information about any Azeri military casualties. Both sides exchanged accusations of using heavy artillery. The Azeri defense ministry said Armenian forces were shelling the town of Tartar. The fighting has prompted fears that regional powers Russia and Turkey could be drawn into the violence. Moscow has a defense alliance with Armenia, while Ankara backs Azerbaijan. Kremlin spokesman DmitryPeskovcalled Monday for hostilities to immediately end and said the situation "is a cause for concern for Moscow and other countries." Turkish President Recep Tayyip Erdogan said Armenia's immediate withdrawal from the region was the only way to ensure peace. The United States called Sunday for the hostilities to end. State Department spokeswoman Morgan Ortagus issued a statement saying the U.S. "condemns in the strongest terms this escalation of violence." The statement urged both sides to work with the OSCE Minsk Group co-chairs "to return to substantive negotiations as soon as possible." .