As stated by the official representative of the UN Secretary General Stefan Dujarrik, Guterres said this during negotiations with Azerbaijani President Ilham Aliyev. 

Dujarrik noted that soon the UN Secretary General will also have a conversation with Armenian Prime Minister Nikol Pashinyan. 

"During the conversation with the Armenian Prime Minister, he will repeat the same statement that he voiced in a conversation with the Azerbaijani President: a call for an immediate cessation of hostilities without preconditions for continuing negotiations under the auspices of the OSCE Minsk Group," Dujarrik quotes TASS.

Earlier, Guterres called on Armenia and Azerbaijan to urgently resume negotiations.

Russian President Vladimir Putin also expressed concern over the resumption of large-scale clashes in Nagorno-Karabakh.