NEW YORK (Reuters) - The United Nations Security Council expressed concern on Tuesday about clashes over the enclave of Nagorno-Karabakh that threaten spiral into all-out war between Armenia and Azerbaijan. After a closed-door discussion on the issue by the 15-member council, they “expressed concern over reports of large scale military actions along the Line of Contact in the Nagorno-Karabakh conflict zone” and “strongly condemn the use of force.” “Security Council members voiced support for the call by the Secretary General on the sides to immediately stop fighting, de-escalate tensions and return to meaningful negotiations without delay,” the council said in a statement. Reporting by Michelle Nichols; Editing by Sandra Maler