So, Kremlin Confirms.

Pashinyan's statement (Armenia is a current chair of ODKB-CSTO) is now repeated on Kremlin's site:

В связи с обращением Президента Республики Казахстан К.-Ж.К.Токаева и ввиду угрозы национальной безопасности и суверенитету Республики Казахстан, вызванной, в том числе, вмешательством извне, Совет коллективной безопасности ОДКБ в соответствии со статьей 4 Договора о коллективной безопасности принял решение направить Коллективные миротворческие силы ОДКБ в Республику Казахстан на ограниченный по времени период с целью стабилизации и нормализации обстановки в этой стране.

Никол Пашинян

Председатель Совета коллективной безопасности ОДКБ,

Премьер-министр Республики Армения

Translation:  In connection with the appeal of the President of the Republic of Kazakhstan K.-Zh.K. Tokayev and in view of the threat to national security and the sovereignty of the Republic of Kazakhstan caused, inter alia, by outside interference, the CSTO Collective Security Council, in accordance with Article 4 of the Collective Security Treaty, decided to send Collective peacekeeping forces of the CSTO in the Republic of Kazakhstan for a limited period of time in order to stabilize and normalize the situation in this country. Nikol Pashinyan Chairman of the CSTO Collective Security Council, Prime Minister of the Republic of Armenia. 

Rumor has it that the forces will be from Belarus and Russia. If so, Russia has her fast reaction forces build around several paratroop brigades and divisions, and if I would have been an MI-6 agent I would try to get the hell out of there before those forces and intel and signint units attached to them get there, because after that that would be problematic because the whole organization and plot will be outed and many people will be interrogated not in Astana (or Nur-Sultan) but in Moscow and that will change the perspective completely.