On May 25, 2026, a meeting took place at the Secretariat of the Collective Security Treaty Organization (CSTO) between CSTO Secretary General Talatbek Masadykov and the Extraordinary and Plenipotentiary Ambassador of the Islamic Republic of Iran to the Russian Federation, Kazem Jalali.

On May 20, consultations of representatives (experts) of the defense agencies of the CSTO member states aimed at improving air defense and developing the CSTO Collective Aviation Forces were held via videoconference at the CSTO Joint Staff headquarters.

On May 20–21, 2026, a Coordination Meeting of Chief Narcologists of the CSTO member states was held in St. Petersburg within the framework of the Russian Federation’s chairmanship in the Collective Security Treaty Organization.

On May 19, 2026, Acting CSTO Deputy Secretary General Samat Ordabayev met in Vienna with Director of the Division for Operations of the United Nations Office on Drugs and Crime Bo Mathiasen.

On May 19, 2026, an international round table on the topic “CSTO: together for strengthening international peace and stability” was held at the Hofburg Palace in Vienna, Austria, on the sidelines of the OSCE Forum for Security Co-operation in Europe.