The presidents of Armenia and Azerbaijan reportedly met on the sidelines of the March 24-25 Nuclear Security Summit in The Hague.
James Warlick, the U.S. co-chair of the Organization for Security and Cooperation in Europe's (OSCE) Minsk Group on the Nagorno-Karabakh conflict, wrote on Twitter on March 27 that Serzh Sarkisian and Ilham Aliyev "spoke together" at the summit.
The mediator wondered whether the two leaders were "really committed to finding a way to [Nagorno-Karabakh peace]?" He did not give more details.
Neither the Armenian nor the Azerbaijani presidency has made any official statement on the reported meeting.
Armenian-backed separatists seized the mainly Armenian-populated region from Azerbaijan during a war in the early 1990s that killed some 30,000 people.
Diplomatic efforts to settle the conflict have brought little progress.
With reporting by Interfax