The European Union considers the recent developments on the Armenian-Azerbaijani border as dangerous and worrying," Peter Stano, the Spokesperson of the EU Foreign Affairs and Security Policy said in a statement on Friday, calling for immediate de-escalation. 

"The European Union urges both sides to refrain from any further military deployment and actions. All forces should pull back to positions held before 12 May and both sides should engage in negotiations on border delimitation and demarcation. We continue to call on Azerbaijan to release all prisoners of war and detainees without delay. We welcome all efforts aimed at decreasing tensions, including proposals for a possible international observation mission," the statement said.

It also expressed readiness to provide expertise and help on border delimitation and demarcation, as well as to support much needed confidence building measures, in order to move towards sustainable peace and prosperity for the South Caucasus.