REUTERS

"I urge the sides to respect the ceasefire, show restraint and prevent any new escalation," Stoltenberg said in a statement issued on April 5.

"NATO supports the efforts of the OSCE Minsk Group. The parties need to go back to the negotiating table and find a comprehensive settlement, under the auspices of the Co-chairs. There is no military solution to the conflict," he said.

Read alsoParties to Nagorno-Karabakh conflict agree to cease hostilities"The peaceful resolution of conflicts is one of the core commitments to which all NATO's partner countries commit when joining the Partnership for Peace."