Belarus President Alexander Lukashenko arrived on a private visit to Yerevan two days ahead of CSTO informal summit.

As NEWS.am reported earlier, CSTO informal summit will be held in Armenia on August 20-22.

Russian President Dmitry Medvedev is expected to arrive in Yerevan on Thursday, whereas CSTO Secretary General is already in the Armenian capital.

President of Tajikistan Emomalii Rahmon will arrive in Yerevan from Sochi where he is meeting with his Russian, Afghan and Pakistani counterparts.

All leaders of the CSTO member states, except for Uzbekistan’s President Islam Karimov are expected to attend the summit.