Vladimir Putin arrived in Yerevan to attend the CSTO summit

Armenian Prime Minister Nikol Pashinyan will also take part in the event, Putin will have a separate meeting with him.

Also there will be President of Belarus Alexander Lukashenko, President of Kazakhstan Kassym-Zhomart Tokayev, President of Kyrgyzstan Sadyr Japarov and President of Tajikistan Emomali Rahmon, RIA Novosti notes.

Earlier, Secretary of the Russian Security Council Nikolai Patrushev arrived in Yerevan.

Armenian Foreign Minister Ararat Mirzoyan, at a meeting with colleagues from the CSTO in Yerevan, said that representatives of the organization will discuss about 20 important issues.